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which mobile do u have. And what happen when you insert sim card. which gsm sim u r using. if error is wrong sim card inserted or invalid chip then you need to unlock your mobile sim card. for that you need sim unlock code. http://mobile-cellphones.blogspot.com/2016/06/android-smartphone-sim-unlocking-details.html
I think your phone is locked to a particular network other than AT&T....so only when you insert AT&T sim you are getting the error message "Sim card invalid"...What is your mobile model? You can get the unique unlock codes for your mobile from unBBlock.com (especially for Blackberry mobile models) at low cost with free unlock instructions.
What is your mobile phone brand and model?If you mobile phone displays the message invalid sim card while inserting other network sim card,its locked to network...You have to unlock it...Visit the site Mobileunlocksolutions.com/supported-phones/rs1wp7/ get the Unlock code and unlock it easily.After Unlock it will accept any GSM Network sim card.
A mobile will display a message as "Invalid SIM" if it is locked to a particular network. Hence a sim SIM card other than the compatible one is inserted, immediately it prompts Invalid SIM or Wrong SIM. To use other networks you first need to unlock the mobile. To unlock your mobile you can use the unlock code. Unlock code can be got from TheUnlockSpot.com once all your mobile information is submitted.
Your mobile is locked with network provider.So whenever you insert a sim, your mobile displays the message like "Invalid SIM" .After unlocking you can use it any network in your mobile. This unlocking can be done through codes. I found a free unlocking service at Unlocking4free.com .If your mobile model is listed here, you can unlock your mobile easily.
It shows Sim Error or else Invalid Sim...Or even though Sim Inserted it asks "Insert Sim" If it says anyone of the error like that means Your Mobile is Locked To Network ..You need T Unlock it to insert other Network Sim GSM Sim Card.... It may locked to some Network....You can get the code here http://www.superunlockcodes.com/supported-phones/rs12wp7/ and Unlock the Mobile from the Network Lock.... I hope..You got solution...
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