[android-developers] how to get phone number through other method

Dear Android experts,

I'm trying to get the phone number through
TelephonyManager.getLine1Number().
As many threads discussed before, it couldn't work in a real device,
null as the result.

Now my question is, whether there is some other way to get the phone
number?

I searched one method said that it could send a sms to Internet
Operator somewhere.
1. could you please provide the detail interface if it is a possible
way?
2. And, is there any difference for the interface among different
Internet Operator?
3. After sent the sms, where to get the phone number? please also
provide the interface if possible.

Looking for your response......

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