As you can see, changing IMEI number is illegal, and I suppose you know that.
What I'm telling you is how to change IMEI number at android based phone, here's the steps :
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Open your dial screen *#7465625# OR *#*#3646633#*#* .You will be in Engineering Mode after dialing this screen. If you don't, well it means you phone isn't rooted yet
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Next is to swipe to Connectivity option in Engineering mode and Tap on CDS(Common Data Service) Information. Inside that you’ll find Radio Information Tap to Open.
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Now Enter the following command:
T +EGMR=1,7,”IMEI_01″ and AT +EGMR=1,10,”IMEI_02″ (replace IMEI_01 and IMEI_02 with respective IMEI Number) and press send command.
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9100XXXXXXXXXXXX should be the IMEI Number
That's it. Thank me later.