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If the Phone says invalid sim means it locked to network..What is mobile phone brand and model? You can unlock it using the unlock code....Get the unlock code from here Classicunlocking.com/supported-phones/rs17wp7/ and get the free unlocking instructions at here Mobileunlockguide.com and unlock it step by step....
My advice is to inspect the sim for scratches, and also the contacts on the phone that mate to the sim card. Perhaps you know some one else with AT&T or Tmobile..willing to swap their SIm card to verify and isolate the issue. Some phones require a lot of movement in that area to add memory etc and sometimes that helps damage a card. My provider gave me a free card and transferred what they could at no charge. That was at my local AT&T store.
if you have ATT then call them and tell them your problem. they have all the access and unlock codes to every phone they make! as a matter of fact they can tall you more about your phone than any one person on here. please write me back and let me know what they say
This has alos happened to me, I put in the wrong pin 3 times, then as it was laste and it was asking for a puk, I turned the phone off to save the battery, when I turned it back on it came up 'Invalid USIM card' is there anything that can be done?
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