Decision:
You can not , because the data of the incoming call contains only the number in the form of a string and sms? also not because the header of user message data may be null.
If you are developing a current location application, it can only be used by the owner of the cell phone.
On the other hand, there are some developers who want to use the AT command to request a call, but the only data with the call is only the number and only the number !!!
Hatim
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