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Dual SIM CRM

Calling CRM: the dual SIM CRM that keeps business calls on one SIM

A dual SIM CRM is a calling CRM that knows which of a phone’s two SIM cards each call used and treats work and personal numbers differently. Calling CRM lets you set a business SIM and back up only that one.

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Default business SIM
Right SIM name on every call
Back up only chosen SIMs

Updated 23 October 2026

Product illustration with sample data

TL;DR · SHORT ANSWER

What is a dual SIM CRM?

A dual SIM CRM tracks which SIM each call used and lets you keep work and personal calls apart. Calling CRM adds a default business SIM and per-SIM backup.

Pick the SIM for each call or fix one SIM for business
Each history entry carries the SIM it truly used, older Android too
Only the SIMs you choose are backed up to the business account

Benefits

Dual SIM CRM benefits

One phone, two numbers, and a clear line between them.

Business SIM by default

Work calls always leave from the work number.

Personal calls stay private

Leave the personal SIM out of backup entirely.

Correct SIM labels

Every call in history names the SIM it used.

Call back on the right SIM

Missed-call alerts let you choose the SIM for the call-back.

Backup rules

Limit sync to office-time calls, or to people already in the CRM.

How it works

How the dual SIM CRM works in Calling CRM

Set it once on each phone; the rules then apply to every call.

Choose the business SIM
Mark one slot as the work line, or have the app ask you before each call.
Pick which SIMs back up
Tick the work SIM, leave the personal one out, and add any extra backup rules.
Call as normal
History shows the SIM on every call; only the chosen SIM reaches the owner’s account.

Features

Dual SIM CRM features table

Every place the app cares which SIM you used.

Dual SIM CRM features
Feature	What it does	Best for
SIM per call	Choose the SIM each time you call	Mixed work and personal use
Default business SIM	Fixes one SIM for business calls	Teams with a work SIM
SIM name in history	Correct SIM on every call, older Android included	Owners auditing calls
SIM backup choice	Only the SIMs you select are backed up	Privacy for staff
Office-time backup	Syncs a call only if it falls in the branch’s schedule	Phones used after work
CRM-contacts backup	Syncs a call only when the other person is a lead, an assigned lead or a paying client	Keeping friends and family out
Missed-call call-back	One-tap call-back with SIM choice	Returning enquiries fast

Dual SIM CRM for staff privacy

Many employees use their own phone with a work SIM added. They are happy for the business to see work calls, not calls to family. Calling CRM handles that with per-SIM backup: the work SIM syncs to the business account, the personal SIM does not.

Two optional filters tighten it further. One syncs only what happens in office time, using the branch’s own schedule, weekly off days and time zone. The other syncs only conversations with people the CRM already knows: leads, leads assigned to that employee, and paying clients. Anyone placed on the exclusion list is ignored by sync and by every automatic action.

Dual SIM CRM call history you can trust

Some phones, especially on older Android versions, report the wrong SIM or use their own codes for incoming, outgoing and missed calls. Calling CRM corrects the SIM label on each entry and picks up a handset’s own call-type codes by itself.

For owners, that means the team call reports count work-SIM calls correctly instead of mixing in personal ones.

Dual SIM CRM with the auto dialer and click to call

The auto dialer places list calls on the business SIM.
Click to call from computer has its own SIM setting.
Missed-call notifications offer a call-back with SIM choice.
WhatsApp calls are tracked separately as internet calls, not on either SIM.

Dual SIM CRM example: a logistics sales team in Lagos

ILLUSTRATION, NOT A NAMED CUSTOMER

A freight forwarding company in Lagos gives each of its 8 sales staff a work SIM to put in their own phones. Staff were worried that a CRM would expose their personal calls.

Each phone has the work SIM set as the business default, and only that SIM is backed up. The owner also limits backup to working hours, Monday to Saturday.

In the first week the owner’s report shows 1,100 work calls across the team and nothing from personal SIMs, and staff keep using their own handsets without complaint.

Dual SIM CRM limits

Worth knowing before a rollout.

Phones with more than two SIMs or eSIM setups are not described here; test one handset first.
iPhone does not allow apps to read the call log, so per-SIM call history is an Android feature; see the iPhone page.
Backup rules decide what reaches the business account; they do not stop a call from being made.
Staff must agree to which SIMs are tracked; be clear about it when you roll out.

FAQ

Dual SIM CRM FAQ

What is the best dual SIM CRM for staff who use their own phones?

One that backs up only the work SIM and leaves personal calls on the phone. Calling CRM does that with per-SIM backup and a default business SIM.

Is Calling CRM a dual SIM CRM?

Yes. Calling CRM lets you pick the SIM per call, set a business SIM and choose which SIMs are backed up.

Can a dual SIM CRM hide personal calls from the owner?

Yes. Leave the personal SIM out of backup, and its calls never reach the business account.

How do I set a default SIM for business calls?

Open the calling settings and mark your work SIM as the business line, or leave it on "ask" to decide per call.

Why does my call history show the wrong SIM?

Some phones report SIM details incorrectly, especially on older Android. Calling CRM fixes the label, so each entry names the SIM it really went through.

Can I back up only calls made during office hours?

Yes. Turn on the office-time rule and only calls inside the branch’s schedule are synced, with its weekly offs skipped and its time zone applied.

Can I back up only calls with leads and clients?

Yes. With the CRM-contacts rule on, a call is synced only when the other side is already a lead, an assigned lead or a paying client.

Which SIM is used when I call back a missed call?

When a missed-call alert appears, its call-back button asks which SIM to use, so returning the call takes one tap.

Does dual SIM call management work on iPhone?

Apple keeps the iPhone call log closed to other apps, so per-SIM history is an Android feature. Everything else in Calling CRM runs on iPhone.

Can some numbers be kept out of the CRM completely?

Yes. Put a number on the exclusion list and neither sync nor any automatic action will touch it.