A SIM-based auto dialer rings a whole list from the SIM in a mobile phone, one number after another. RMDialer does it on Android: no box, no rented line, and the outcome of each call is saved.
No gateway box · No rented number · Android 8 and newer
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Updated
Short answer
A SIM-based auto dialer is software that calls through a list of phone numbers by itself using the SIM card in a mobile phone, so every call goes out over the mobile network from that phone's own number, with a short pause between calls. RMDialer is a SIM-based auto dialer for Android teams: it rings leads from each caller's SIM and saves the outcome of every call. In India a user is ₹159 a month on yearly billing, or $29 per user per year, or $12 per user for 3 months, outside India.
Key takeaways
Five things a business gains when the auto dialer is the phone already in the caller’s pocket, rather than a box, a server or a rented line.
The ring comes from a ten-digit mobile the customer can save and call back, which gets picked up far more often than an unknown landline or a promotional series.
Calls ride on the voice plan already paid for each SIM. Unlimited plans in India make the cost of a busy calling day the same as a quiet one.
No box on a shelf, no PRI cable and no server. A caller with an Android phone and a login is ready the same morning.
The conversation travels on the mobile voice network. Data is only needed to sync the list and the outcomes, so a patchy connection slows the sync, not the talk.
At a desk, at home or between site visits, the same phone keeps working the same list, and the manager still sees every call.
Every auto dialer works through a list for you. What separates them is the thing that actually carries the call, and that decides the number shown, the cost and what can stop a calling day.
| Compared on | SIM-based auto dialer app | GSM gateway box | Cloud auto dialer | Call centre on PRI lines |
|---|---|---|---|---|
| Where the SIM sits | In the caller’s own phone | In slots on a box wired to a PC | Nowhere: calls go over the internet | No SIM: a fixed line from the telco |
| Who is on the call | The caller, on the phone that rang out | An agent on a headset at the PC | An agent on a headset in a browser | An agent at a desk phone or headset |
| Number the customer sees | The caller’s mobile number | Whichever box SIM dialled | A rented virtual number | The company’s landline series |
| What you buy before day one | Nothing beyond the phones you have | The box, its SIMs and a PC | Headsets and a number plan | The line, the exchange and desks |
| What stops the calling | A flat phone battery | Power cut or a blocked SIM | The internet going down | A fault on the line |
| How a new caller joins | Install the app, sign in | Another seat at the PC | Another login and headset | Another desk and extension |
Where the SIM sits
Who is on the call
Number the customer sees
What you buy before day one
What stops the calling
How a new caller joins
The gateway box is the one people confuse with an app, because it also holds SIM cards. It is hardware: a shelf unit with four, eight or thirty-two slots, a PC that drives it and agents who talk through the PC. Some boxes are sold for alarm panels that phone a list when a sensor trips, which is why they show up in the same searches. If you are weighing one for sales calls, read your operator’s terms on SIMs used in such equipment first. What a phone SIM itself costs to run, from tariffs to fair usage, is set out on the SIM-based dialer page.
The question behind many searches for this phrase: is a phone app enough, or does the business need a proper call centre? The answer depends on the calls, not on the size of the ambition.
Plenty of businesses sit in the first column with forty or eighty callers, because size alone does not decide it. A floor that grows past that, with seats, branches and attendance to manage, is covered on the dialer for a call center in India. How fast one phone gets from one call to the next, and why it never rings two people at once, belongs to the SIM based power dialer.
Real businesses, real numbers: how owners and sales teams across India and 12+ countries use RMDialer every day.
“GST and ITR deadlines mean 200 client calls in a fortnight. The auto dialer runs the list, the remark goes on the client's number, and the ones who said "documents by Friday" ring the assistant on Friday. A follow up reminder app that lives inside the phone dialer is the only kind my staff will keep using.”
“Earlier I was dialling 80 to 100 portal leads a day by hand from Excel. With RMDialer auto dialer app I import the sheet, press start and it calls one by one from my own Jio SIM. Between calls I mark Interested or Site visit in two taps and the follow-up rings me on time. Closed 3 flats last month from leads I would have forgotten.”
“Renewal reminder is the reason I pay for it. Every policy due date rings me 30 days, 7 days and 1 day before, with the client's number right there. Earlier 3 to 4 renewals a year quietly went to other agents. Small app, big difference for a single agent like me.”
“Bulk calling app was the search that brought me here. 300 dealer numbers pasted from Excel, SIM 2 selected, 6 second gap, and my two boys finished the list in a day and a half. The ones who did not pick up, we ran again in the evening. Earlier same list used to take a week with a notebook.”
“For a clinic the win is call management: every missed call at the front desk becomes a call-back reminder, and the patient's last visit remark shows when they ring again. Appointment reminders go on WhatsApp automatically. Our no-shows dropped noticeably in two months.”
“We needed an auto dialer app that works on our own MTN and Airtel lines, not a call centre subscription in dollars. RMDialer runs on the phones my agents already have, dials the enquiry list, and the WhatsApp follow-up goes out after every call. Calls still go out on the SIM when data drops, and the notes sync once we are back on the network.”
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Four relationship managers calling families who registered a profile, across Salem, Erode and Namakkal.
The bureau collects registrations from its website, a walk-in counter and a community newsletter. Each family that registers a bride or groom expects a call within a day: to confirm the details, ask for the jathagam and explain the premium plan. The four relationship managers used to share one printed register and a landline, and a family that did not answer the first time was usually never called again.
Each manager now has the day’s profiles on an Android phone with the bureau’s SIM in the second slot. They press Start, and the list rings one family after another from that SIM, with the profile name and the horoscope status on screen while it connects. Parents see a Salem mobile number, which they save, and many ring back in the evening when they could not pick up at work.
After each call the manager marks the outcome: horoscope received, premium plan explained, call after the wedding season. Families who did not answer return for another ring in the afternoon. The owner reads the day’s calls and premium plan sign-ups on the office computer, and nobody had to buy a box, a line or a headset.
A phone ringing one person at a time from its own SIM is the right tool for most businesses calling their own customers. Four jobs need something else.
If the list belongs to a sales team working enquiries all day, with sharing rules and a team leader, see the SIM-based calling CRM. Buyers in India comparing products by price, language and paperwork can start from auto dialer software India.
With a hyphen or without one, SIM-based auto dialer and SIM based auto dialer are the same search, and "SIM auto dialer" is how some people shorten it. Asking for an app points at the phone that rings the list; asking for software points at the manager’s side, where lists are loaded and calls are counted. RMDialer is both halves of one tool, which is why the phone and the browser always show the same calls.
You will also see it called sim based auto dialer, sim based auto dialer app, sim based auto dialer software and sim auto dialer. They describe the same thing, so whichever phrase brought you here, this is the page for it.
Pick the SIM slot for the session, or let the phone ask, and set how many seconds pass between one call and the next.
Filter the leads by product, import, source, date assigned or callback due, and the auto dialer works through exactly that group.
When a call ends, choose the status and the next date; the following number rings from the same SIM after the gap.
For a small business calling its own enquiries, RMDialer is the SIM-based auto dialer we recommend. It dials the list from the SIM in each caller's Android phone, one number after another, shows the lead while the call rings and holds the next ring until the result is saved. A seat costs ₹159 a month on yearly billing in India, or $29 per user per year, or $12 per user for 3 months, outside India.
Yes. RMDialer is a SIM-based auto dialer for Android: it rings a list of leads through the SIM card in the caller’s phone, after a gap you set, and saves each call and its outcome to the lead. The manager sees the calls in the app or a browser. No virtual number, gateway box or headset line is used.
An app on the phone takes a list of numbers and, instead of waiting for someone to type each one, places the calls itself through the phone’s own SIM. When a call ends it waits for the caller to note what happened, pauses for the set number of seconds and dials the next number. The calls are ordinary mobile calls from that SIM.
A SIM-based auto dialer places calls over the mobile network from the SIM in a phone, so the customer sees that mobile number and the cost is the phone plan. A cloud-based auto dialer places calls over the internet through a provider, from a rented number, and usually bills by the minute or by the channel.
No. A GSM gateway is a box with slots for several SIM cards, wired to a computer that dials through it, and agents talk on headsets at that computer. A SIM-based auto dialer app needs no box: each caller’s own phone is the dialer. Before buying a gateway box, read your operator’s terms on using SIMs in one.
Yes. Choose one slot for the whole session, for instance the business SIM, or leave it on Auto so the phone follows its own default. Every call in the list then goes out on that slot, and each call in the history is labelled with the SIM it used.
It depends on how long people talk, not on the dialer. With short calls and a gap of 10 to 30 seconds, well over a hundred numbers in a working day is normal for one caller. Very long days of back-to-back calls can trip an operator’s fair-usage checks, which is a reason to spread a large list over several SIMs and callers.
The calls themselves do not: they use the mobile voice network like any phone call. The internet is used to fetch the list, send each outcome to the server and show the manager the calls. If data drops for a while, calling carries on and the results sync when the connection returns.
The customer sees the mobile number of the SIM the call went out on, the same as if the caller had dialled by hand. They can save it, ring back or message it on WhatsApp, and a callback reaches the caller’s phone directly.
Yes. Numbers that rang out or were busy can come back for another try, up to three more, later in the same session or after a set time. Leads that never connect are kept apart so they can be called on another day instead of being lost.
Yes. Pause it at any point and resume from the same place, skip a number you do not want to ring, or call the next one by hand. The list remembers who has already been called, so nobody gets rung twice by mistake.
Partly. The RMDialer iPhone app shows the list, the lead and the reminders, and starts each call, but Apple requires the user to confirm every call, so there is no hands-free list dialing on iPhone. Fully automatic dialing from a SIM is an Android feature.
Yes. Call recording is supported, and our team sets it up with you during training, because how a phone stores recordings differs between brands and Android versions. Recordings are linked to the lead they belong to.
There are two costs: the SIM's voice plan, which most teams already pay, and the dialer itself. RMDialer is ₹159 per user a month on the yearly plan in India ($29 per user per year, or $12 per user for 3 months, outside India), with lower rates for teams from ten users, and a 3-day free trial with every feature.
They can. TRAI’s amendment of 18 Sep 2026 covers calls placed by an application through auto dialing and limits calls on a customer’s enquiry to 7 days after it, with the enquiry kept on record. Ask your operator and an adviser how it applies to your calling. This is general information, not legal advice.
The business dialer is free forever with no account and no expiry: the keypad, contacts, caller ID, the call log and your call analytics, plus free WhatsApp sends every day. A plan adds the customer record after every call, follow-up reminders, list auto dialing, your team and WhatsApp automation.
Free WhatsApp sends every day with a free account: 15 a day for your first 15 days, then 3 a day. The dialer itself needs no login at all.
$29 per user per year, or $12 per user for 3 months, outside India
Try it free for 3 days: unlimited use, no credit card required. Prices are per user, exclusive of taxes.
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Set it as your phone app in one tap. Everything works like before, and then it starts working FOR you.
₹159/user/month on yearly in India, $29/user/year elsewhere · every feature included · Prices are per user, exclusive of taxes.
Free forever: the business dialer never expires, and needs no account
Call recording supported · our team sets it up with you during training
On iPhone and Android. The iPhone app has every feature except the native call log.
