How to Sony Xperia E1 - Unlock Network / SIM Lock by Code

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How to Permanent Unlock Network, SIM Lock by Code ( PIN ) any Sony Xperia Smart Phone.

First, check the SIM lock status in Service Menu - from the Phone dialer app tape *#*#7378423#*#* Service info ► Sim lock
o Network 5
x Network subset 0
x Service provider 0
x Corporate 0
x SIM 0
Normally, Sony Ericsson phones comes only with a network lock as active.
o Network 5 - the phone is Network locked and you have 5 attempts to enter the unlock code. If there is a 0 beside the category where a lock exists, then it means that your phone is hard locked and you can't unlock it by code.

To find the IMEI number dial this code *#06#.
The unlock code is unique for every phone. You have to provide the IMEI number from your phone to get your unique unlock code.
When you have your unlock code, insert SIM card from another provider.
When the phone ask you for SIM network unlock PIN, enter this unlock code.
If your contract has ended, you can request the code from your provider. Another way is to buy an unlock code.