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Is your phone locked with any particular network?I suggest you can approach Unlocking4u.com and specify the country,locked network of your Sony Ericsson K750i.Based on the availability you can get the phone unlocked.
your phone is locked to att network that means your phone will only accept att sim card unless you unlock it. you can purchase unlock code from website www.cheapunlock.com or www.unlockitnow.com or www.yourunlockcode.com
Unlocking the network lock is rather difficult by generated codes. All the time it doesn't works. If you got that unlocking code by reeliable sources then try to enter it without simcard, it will not show you network error and will paste that code at the place when it should be. This is for Tejbha.
Pyper16....PUK (personal unlocking code) may be obtained from your network service provider company by making call to their customer support section (it is call free no.). The operator online will ask you 2-3 question of your personal detail like residence and full name etc,. then he will provide you that code and instruction to enter it and reset your security code. You are advised to remember your security code as it is necessary to obtain uninturupted service/