SIM-based call management CRM
Track every business call your team makes from the Android phones and SIM cards they already carry. Diallogs reads the native call log, so calls attach themselves to the right lead — no VoIP, no PBX, no virtual numbers, no porting. From ₹125 per license per month.
4.6★ from 91 Google Play reviews · 10,000+ downloads · Android only · 30-day free trial, no credit card
The problem with tracking mobile calls
Take a fifteen-person team selling home loans. Every rep already has an Android phone and a business SIM. They make somewhere north of a thousand calls a week between them, and every one of those calls is already recorded — on fifteen separate handsets, in fifteen separate call logs, attached to nothing.
The owner has two ways to fix that. Move everyone to a cloud VoIP system, which means new numbers, a data dependency, a per-seat licence several times the cost, and reps learning a new way to dial. Or keep the phones and the SIMs exactly as they are, and put a layer on top that reads what the devices are already recording.
The second option is what a SIM-based call management CRM is. The reason it works is not technical elegance — it is that nothing changes for the rep. The most common way a CRM rollout dies is reps quietly not using it. A system that requires no new habit has nothing to resist.
How it works
Four steps, and three of them are things your team already does.
- 01
Rep installs the Android app
No new handset, no new SIM, no number change. Setup is minutes, not a provisioning project.
- 02
They dial exactly as they always have
From the native dialler or from within Diallogs. Nothing about the calling habit changes, which is the single biggest reason CRM rollouts fail.
- 03
Diallogs reads the native call log
Number, direction, timestamp and duration are captured automatically and attached to the lead record. No manual entry, so nothing depends on memory.
- 04
The manager sees it centrally
Calls per rep, connect rate, duration and follow-up status across the team — updating through the day, syncing late from any device that was offline.
SIM-based or VoIP
Neither is better in the abstract. They fail in different places, and the honest answer depends on where your team actually works.
| VoIP calling | SIM-based calling | |
|---|---|---|
| Connection depends on | Internet bandwidth | Mobile network signal |
| Works offline | No | Yes — logs sync later |
| Rep's number | New virtual number | Their existing number |
| Setup | Provisioning, porting, training | Install an app |
| Typical monthly cost | Several times higher per seat | From ₹125 per license |
| Call routing / IVR | Yes | No |
| Desktop or browser calling | Yes | No — Android only |
Working through this in more depth: VoIP vs SIM-based calling for sales teams, and if you are running high dial volumes, what works best at 80+ dials per rep per day.
Where it fits, and where it doesn't
Good fit
- Telecalling floors running 80–250 dials a day
- Field sales teams who are never at a desk
- Real estate, insurance, loan/DSA and collections teams
- Businesses in areas where data coverage is unreliable
- Teams who want calls tracked but already have a CRM
Not a fit
- Teams who need to call from a laptop or browser
- iPhone-based teams — Diallogs is Android only
- Anyone needing cloud call routing, IVR or virtual numbers
- Teams wanting predictive or auto-dialling over the internet
What rollout actually looks like
The honest version, including the parts that take longer than a vendor usually admits.
Most of the effort in putting a calling CRM on a team is not technical. Installing the app on twenty phones takes an afternoon. Getting twenty people to leave it installed and keep permissions granted is the part that decides whether you have data in six weeks.
Day one. Install on a pilot group of three or four reps rather than the whole floor. Pick people who are neither your best performer nor your most reluctant — you want a normal week, not a showcase. Set up tracking configuration with them in the room so they see the per-SIM switch themselves rather than being told about it.
Week one. Do not look at the numbers yet. The first few days of any tracking rollout produce distorted data, because people behave differently when they know something new is watching. What you are checking in week one is whether calls are being captured at all on each handset model your team uses.
Week two. Now the numbers mean something. Compare connect rates between reps and look at the spread rather than the average — the gap between your best and worst connect rate usually says more about list quality and calling hours than about effort.
Week three onward. Roll out to the rest of the floor. By this point you have answers to the two questions everyone asks — whether it works on their phone, and whether it sees their personal calls — from colleagues rather than from management, which is the only version anybody believes.
Questions your IT or ops lead will ask
Fair questions, and the answers are less complicated than the category usually makes them sound.
Do we need to buy new phones?
No. Any reasonably current Android handset with the team's existing SIM works. There is no supported-device list to procure against, though call recording specifically is handset-dependent and worth testing on the exact models your team carries.
What happens to our existing numbers?
Nothing. There is no porting step at all, which also removes the usual porting risk window where numbers are unreachable for a day or two mid-migration.
What if a rep is out of coverage?
The call still happens, because it is going over the mobile network rather than the internet. The record is written on the device and syncs when the handset reconnects, so a day spent in a low-signal area does not create a hole in the reporting.
Can one person use two phones?
A license can move between handsets, but it is active on one at a time. If you genuinely need two phones tracked simultaneously — a desk phone and a field phone, say — that is two licenses.
What happens when someone leaves?
The call history belongs to the lead record rather than to the individual, so it stays when they go. Their license is reassigned to whoever replaces them.
Is this a dialler?
No, and it is worth being clear about that before you evaluate it. There is no predictive dialling, no call queueing, no IVR and no routing. It records and organises calls your team places themselves.
What it costs
Call tracking and lead management are separate tiers on purpose. If you already run a CRM your business is happy with, take the calling layer alone and leave the rest where it is.
Call Recording Storage add-on: ₹125/GB per license. Yearly billing saves 7%. Recording availability depends on your phone brand and Android version — test your exact device before rollout.
Common questions
What is a SIM-based call management CRM?
A SIM-based call management CRM tracks business calls made from the mobile network on a team's existing phones and SIM cards, rather than routing calls over the internet. The CRM reads the native Android call log, so every call is recorded against a lead automatically without the rep entering anything. There is no VoIP service, no PBX hardware and no number porting involved.
How is SIM-based calling different from VoIP for a sales team?
VoIP places calls over an internet connection and needs stable bandwidth, a virtual number and usually a per-seat licence costing several times more. SIM-based calling uses the mobile network the team already pays for, so call quality does not depend on data speed, reps dial from their own number, and there is nothing to set up beyond installing an app. VoIP suits distributed teams that need cloud call routing; SIM-based suits field and telecalling teams in India who need calls to connect reliably on the move.
Does a SIM-based CRM work without internet?
Yes. Because the call itself goes over the mobile network, calling works wherever there is signal. Diallogs logs the call on the device while offline and syncs the record when the phone reconnects, so reps in basements, lifts or low-coverage areas do not lose call data.
Do reps need to change their phone number?
No. Reps keep their existing SIM and number. There is no porting step, which also means the numbers customers already recognise and save stay the same.
What does a SIM-based call management CRM cost?
Diallogs starts at ₹125 per license per month for call tracking and monitoring, and ₹250 per license per month if you also want lead management. There is a free plan for personal call log analytics, and Enterprise pricing is custom. Call recording storage is an add-on at ₹125 per GB per license. All paid plans include a 30-day free trial with no credit card.
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Try it on your own team for two weeks
Put your reps on it, keep their phones and numbers exactly as they are, and compare what you can see at the end of a fortnight against what you can see today.