Sometimes, our phone IMEI become invalid because of any problems.
If network service become null due to invalid IMEI, you must try this method.
**DIY Steps
1. Check your IMEI code by dialing *#06#. Check to sure IMEI is really invalid.
2. Close your phone and note the IMEI code under the battery.
3. Power on your phone and then dial *#*#3646633#*#*.
4. It will show you telephony connectivity. Enter to CDS information and again to radio information.
5. You may find phone.1 and phone. 2.
6. Don't think too much, choose phone.1. You can find AT+ at a top place. Tap on it.
7. Enter your IMEI code and hit send AT. If it shows fail, reboot your phone by pressing power button carefully.
8. After reboot, IMEI is vaild to use network services.
>> This method might not work on every android OS.
>> This method is perfect but not so easy to use.
>> So, you should take care on fixing this problem.
>> Good Luck!!
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