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        What do you mean when you say "decode" any mobile phone?  I've never heard of "decoding" a mobile phone.  I assume you mean unlocking a phone.  And the process can vary from phone to phone.
 
 For example, with Android powered phones, it usually involves forcing a fake update to the firmware that gives the you Superuser privileges (similar to Administrator privileges in Windows).  This process is called "rooting".
 
 If you want to unlock a phone, you're best bet is to search on Google.  Keep in mind that unlocking a phone voids the warranty.
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