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Glossary · Dialing

Preview dialer

A preview dialer is a dialer that shows the agent the lead’s record and waits for them to trigger each call: maximum preparation, minimum speed, right for high-value low-volume calling.

Definitions checked 2 September 2026.

Preview dialing puts a pause before every call. The system presents the next lead, the caller reads the history, the last remark, the quotation, and decides when to dial, or whether to skip. Nothing rings until they say so. It is the slowest of the dialing modes and the most prepared, which is why it suits calls where the first ten seconds depend on knowing the customer: renewals, repeat buyers, large-ticket follow-ups, complaints.

The distinction from power dialing is only the trigger. A power dialer starts the next call itself after the gap; a preview dialer waits for a tap. Many teams run both in one day: preview mode for the morning's twenty important call-backs, power mode for the afternoon's list of fresh enquiries.

A CRM dialer gives preview dialing for free, because the record is already on the call screen. In RMDialer, which we make, opening a lead and calling from it is preview dialing, and the auto dial session is power dialing; the caller picks per list. A related habit worth naming: the remark saved after the last call is what makes the preview worth reading, so the two-tap after-call sheet is where preview dialing actually begins.

Preview dialer and related telecalling terms, with what each one means
Term What it means
Preview dialer A dialer that shows the agent the lead’s record and waits for them to trigger each call: maximum preparation, minimum speed, right for high-value low-volume calling.
Power dialer (progressive dialer) An auto dialer that dials exactly one number per free agent, the moment their previous call ends. Every answered call meets a human instantly, so there are no abandoned calls.
Auto dialer Software that dials phone numbers from a list automatically, one after another, so the caller never types a number and only does the talking. Also searched as automatic call dialer, automatic phone dialer or auto calling app: same tool, same category.
CRM dialer A phone dialer and CRM in one app: every call opens with the customer’s record on screen and ends by updating it in two taps, so the CRM fills itself from the calls. Also searched as sales dialer, dialer CRM, or CRM with built-in dialer.
Remark The one-line note saved the moment a call ends (“wants the bigger model, deciding Sunday”). The remark is what makes the NEXT call a continuation instead of a restart.
From the term to the tool

Can you try preview dialer in RMDialer for free?

A definition is easier to hold once you have watched it happen on a real call. The dialer is free for good and needs no account, so reading about the term and trying it are about a minute apart.

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  • Your phone app: keypad, contacts, call log and caller ID
  • Spam and unknown-number screening on every incoming call
  • Call analytics: your day counted, by outcome, and by who you called
  • Missed calls kept in their own list, so nothing is returned late
  • Sending WhatsApp from a call, free every day

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.

On a plan

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$29 per user per year, or $12 per user for 3 months, outside India

  • The customer record: lead status and remarks saved against every call
  • Follow-up reminders that ring like an alarm on the day you set
  • Auto dialing a whole list without touching the phone
  • Your team: seats, assigned calling lists and per-person reports
  • Automatic WhatsApp after calls, bulk sending and the WhatsApp API inbox
  • Backup and restore, so a new phone carries on where the old one stopped
  • Leads arriving on their own from Google Sheets, APIs and lead portals

Try it free for 3 days: unlimited use, no credit card required. Prices are per user, exclusive of taxes.

Questions

What do people ask about preview dialer?

When should I use preview dialing instead of auto dialing?

When the outcome depends on preparation: renewals, high-value follow-ups, existing customers, complaints. For fresh enquiries where speed matters more than context, let the auto dialer run.

Is preview dialing slower?

Yes, by design. The pause to read the record is the feature. Use it for the calls that earn it and power dialing for the rest.

What is an auto dialer app?

An auto dialer app calls a list of phone numbers one after another so the caller never types a number. On Android, an app like RMDialer runs the session on the phone itself using the SIM already in it: you pick a list from Excel, a Google Sheet, an API or assigned leads, press start, and the app dials each number in turn while you mark the outcome between calls.

Does RMDialer work on iPhone?

Yes. There is an iPhone app as well as the Android one, and it carries every feature except the native call log: leads, statuses, remarks, follow-up reminders, WhatsApp, templates, clients and team sync all work on iOS. Apple opens the call log to no app, so calls made on an iPhone are not recorded into the history by themselves, and only Android lets RMDialer become the phone app that answers with the customer on screen. The iPhone app is free on the App Store for iOS 17 or newer. The Web CRM works in any browser, including Safari.

How does an auto dialer work on a mobile phone?

The app becomes the phone's dialer, reads a list you give it and places each call over the SIM the same way you would by hand, only without the typing. After each call it waits a few seconds (the gap you set), shows a two-tap outcome sheet, then dials the next number. Numbers that did not answer can be rung again in a fresh session later.

Which is the best auto dialer app for Android in India?

For small and mid-sized Indian teams the best fit is a SIM-based auto dialer that runs on the phones they already own, because customers answer normal mobile numbers and there is no per-minute bill. RMDialer is that kind: the dialer is the phone app, the lead CRM, WhatsApp automation and team reports are in the same price, and the basic dialer is free with no login.

Can I auto dial numbers from an Excel sheet?

Yes. Save the sheet as Excel or CSV with a mobile number column (name and any other columns are optional), import it in the app, and start a session. The dialer calls the rows in order and lets you mark each outcome. The same works from a Google Sheet, which can also be connected as a live source so new rows import themselves.

What is a good gap between auto-dialled calls?

Five to ten seconds. That is enough to save the outcome of the last call and glance at the next lead's details without breaking rhythm. Set it longer, 15 to 20 seconds, for teams that write a proper remark after every call, and shorter for confirmation or reminder campaigns where the script is fixed.

What is the difference between a power dialer and a predictive dialer?

A power dialer calls one number at a time for one agent and waits for that call to end, so every answered call has a person ready. A predictive dialer calls several numbers at once and connects the ones that answer to whichever agent is free, which needs a call-centre server and causes dropped "silent" calls. Mobile auto dialers like RMDialer are power dialers on a SIM.

Can an auto dialer skip busy numbers and retry later?

In RMDialer the caller can skip any number during a session. For retries, switch on Call again if not answered: each missed person gets a limited number of extra rings at a pause you pick, without holding up the rest of the list. You can also filter the busy and unanswered numbers and start a fresh session later, ideally at a different hour, without re-importing the sheet.

Is an auto dialer legal in India?

Yes, for calling your own leads and customers. An auto dialer is only a faster way to place normal SIM calls, so the same rules apply as for manual calls: do not call numbers registered on the national DND list with promotional offers, honour opt-outs, and follow TRAI's rules for commercial communication. Calls to people who enquired with you, existing customers and service calls are routine.

Why do customers not answer calls from virtual numbers?

Because caller ID apps and phone dialers increasingly flag pooled virtual and VoIP numbers as spam or business calls, and because the same virtual number is often used for many campaigns. A real mobile number from a local SIM looks like a person calling, which is why SIM-based dialers report higher connect rates in India.

How many calls should a telecaller make per day?

Set the target from your own first week rather than a number from elsewhere: count dials, connected calls and saved outcomes per person, then raise it gradually. Connected conversations and outcomes matter more than dials. An auto dialer removes the dead time between calls, finding the number and typing notes, so the same person reaches more people without working longer.

How can I import leads from Facebook lead ads into a dialer?

Connect the Google Sheet that Facebook writes leads into as a lead source. Rows are checked on a schedule you set, every 30 minutes by default, then de-duplicated and tagged with the source, so the enquiry reaches a rep's calling queue the same hour instead of waiting in a spreadsheet until someone exports it. Connect the same sheet under Live Sheets in the Web CRM to share new rows across your callers in turn.

Can leads from JustDial and IndiaMART be called automatically?

Yes. Export or connect the portal's lead list (most portals email or expose leads by sheet or API), let the app import new enquiries on a schedule, and set the fresh leads to auto dial first. Speed to lead is what wins portal enquiries: the first supplier to call usually gets the order.

Customer reviews

RMDialer reviews from business users

Real businesses, real numbers: how owners and sales teams across India and 12+ countries use RMDialer every day.

Rated 4.9 by customers 4.7 on Google Play 5K+ downloads India + 12+ countries
  • “Telecaller app for Android that my staff actually use. Enquiry list is assigned to each telecaller, the auto dialer calls it from their own SIM, and test ride bookings come to me live. Punjabi interface for the girls at the desk. Price is honest, everything included, no per-user surprises.”
    Harpreet Singh Owner · Two-wheeler showroom Ludhiana
  • “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.”
    Grace Okafor Managing director · Travel agency Lagos, Nigeria
  • “We looked for telecalling software for a nine-person loan team and every quote came with cloud seats and per-minute bills. RMDialer telecalling software runs on the callers' own Jio SIMs: the lead list dials itself, the remark goes on the number, and I get dials, connects and talk time per caller every evening. Cost is one flat price per user.”
    Kavita Iyer Operations head · Loan DSA Chennai
  • “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.”
    Rakesh Choudhary Real estate consultant · Property advisory Jaipur
  • “We tried two telecalling CRM software before this and my counsellors stopped filling them within a week. RMDialer is the phone app itself, so every admission enquiry gets logged whether they like it or not. The auto WhatsApp after call sends the fee structure by itself. I see all 4 counsellors' calls on the web CRM every evening.”
    Priya Nair Owner · Coaching institute Kochi

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