Locked without a clue of the lock code
The lock code on my samsung m300 is the last 4 digits of my number. try that, also you can try 0000. that is all i can think of.
Hey,
Call your service provider to ask your Samsung Network Unlock Code. when you change your current network provider you must need to Unlock your Samsung first. after unlocking you can use your Samsung to any network.but network provider take time to give your imei unlock code.
second option is,
you can buy your Samsung Imei Unlock Code from third party . this is safe way to Unlock your Samsung . they will charge little amount but they give your Samsung SPH-M300 Imei unlock code immediately.
i hope this information is help you.
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M samsunh sph m300 is locked as i stupidly changed the lock when i was drunk
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