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When you set up a phone number that is displayed on the client’s phone screen, you must use a number that is registered with the same mobile network carrier that is used to make a call (i. e.For example, if you make calls with Megafon, then in the Definable phone number filed you should enter a phone number that is registered with this mobile network carrier). Otherwise, the call may not succeed, the line may be busy or the client may be unavailable. To use a phone number as your CallerIDCaller ID, you must send a request to the Twin technical support.