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my network information
NAME : TRUE-H INTERNET
APN : internet
Username : true
Password : true
MCC : 520
MNC : 00
APN Type : internet
HELP PLEASE 
Solved! Go to Solution.
Restart the phone > try again
make sure that after you enter the APN settings you click on save APN
i Try but it not work ;(
That's odd, do you have data enabled? how old is your SIM card?
What if you boot on safemode and then try again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008