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UK mobile numbers — those beginning with 07 — can be connected to Kallin using your network’s built-in call divert feature. This means you can bring the power of Kallin’s routing, voicemail, IVR, and analytics to your existing mobile number without swapping your SIM, changing provider, or purchasing any hardware. Kallin never touches your SIM card or mobile subscription; it simply receives the calls that your network forwards on your behalf.

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Supported Networks

Kallin supports call divert from all major UK mobile networks and virtual operators, including:
  • Vodafone
  • O2
  • EE
  • Three
  • Sky Mobile
  • iD Mobile
  • Virgin Mobile (MVNO operating on the EE network)
If your network is not listed above, it is likely still compatible as long as it supports standard GSM call divert codes. Contact Kallin support to confirm.

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How Mobile Connection Works

Mobile numbers connect to Kallin through call divert, which is a standard feature built into every UK mobile network. You dial a short code from your mobile to instruct the network to forward incoming calls to Kallin’s assigned DID number for your account. There are two main types of divert:
  • Unconditional divert — all incoming calls to your mobile are immediately forwarded to Kallin, before your phone even rings.
  • No-answer divert — your mobile rings first, and if you do not answer within a set number of seconds, the call is forwarded to Kallin.
No SIM card is required in Kallin, and your mobile number and plan remain entirely with your network. You continue to make outbound calls from your mobile as normal.

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Setting Up Call Divert by Network

Find your network in the tabs below. You will need your Kallin DID number, which is displayed in your Kallin dashboard under Numbers > Add Number > Mobile after you start the connection process.
Unconditional divert (all calls forwarded immediately):
No-answer divert (calls forwarded after your phone rings unanswered):
To cancel unconditional divert at any time, dial ##21#. To cancel no-answer divert, dial ##61#.
Replace [Kallin DID number] with the full number shown in your Kallin dashboard, including the international prefix (e.g. +44207123456). Enter the divert code directly into your phone’s dialler and press call — you will hear a confirmation tone or message from your network when the divert is active.

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Verifying the Connection

Once you have set up call divert on your mobile:
1

Return to your Kallin dashboard

Navigate to Numbers > Add Number > Mobile.
2

Enter your mobile number

Type your mobile number in E.164 format (e.g. +447700900123) and click Verify.
3

Kallin places a test call

Kallin will place a test call to your number. Because divert is now active, the call will route through to Kallin automatically.
4

Confirmation and configuration

Once the test call is confirmed, your mobile number appears as a connected number in your Kallin dashboard, ready to configure with routing rules, voicemail, and business hours.
Your mobile network may charge for calls that are diverted, depending on your tariff. Diverted calls are often treated as outgoing calls from your mobile to the Kallin DID number. Check your plan’s terms or contact your network to understand any applicable charges before setting up unconditional divert.
Unconditional divert forwards every incoming call — including personal calls, two-factor authentication codes delivered by voice, and any other calls you might want to receive directly on your phone. Make sure this is the behaviour you want before activating it. If you only want Kallin to handle calls when you are unavailable, use no-answer divert instead.
No-answer divert is the most popular setup for mobile users. Your phone rings as normal, and if you do not pick up within the timeout period (typically 15–30 seconds, depending on your network), the call passes to Kallin where your voicemail, IVR, or routing rules take over. This way you stay in control of calls you want to take personally, while Kallin handles the rest.

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Next Steps

Port Your Number to Kallin

Move your mobile number fully to Kallin and remove the dependency on call divert.

Configure Call Routing

Set up routing rules, voicemail, and business hours for your connected mobile number.