Hi invalid Sim occurs because your mobile is locked to particular network due to this it accept only that particular network if you insert other provider sim card it shows invalid sim to remove this you should unlock your mobile we can unlock using software,cable ,codes etc but codes seems to be simple compared to other since it saves our time a lot many online sites render unlock codes
i got the unlock codes from here
http://www.onlinegsmunlock.com/motorola-a1000/rs7wp9/
here you select the model of your mobile and country provider to which your mobile get locked and get the unlock codes from them.
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