If you want to unlock the Sony Ericsson J300i with the IMEI code, we can do this no problem; all sony ericsson mobiles are unlocked by code. After introducing the code the mobile will be unlocked, without losing its warranty or any data. These unlock codes are calculated in minutes.
1.- Turn on your Sony Ericsson with a not Accepted SIM, introduce the PIN number if there is one and press OK.
2.- The phone will indicate: “Insert correct SIM”
3.- Now enter “left asterisk asterisk left” and a menu hidden will appear.
4. - Select Network, MNC2, and in NCK: enter the code and press OK.