Question about Sony Ericsson K660i Cellular Phone

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My phone keeps saying invalid u sim on every sim i put in it on 3 and wont pick up any network

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Is this a new phone? If so, make sure you are putting the sim card in the correct way (some phones are tricky). If you are attempting to add a sim card from a different network than what the phone is registered through, it often won't work unless you jailbreak it (a whole different solution). This is not legal, and often won't give you full capability of the phone. Finally, if you think it is a problem with the sim card, it might be rusty or dirty. Try lightly cleaning it with a soft eraser from a pencil. Good luck!

Posted on May 22, 2011

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Posted on Jan 02, 2017

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Hope this may help;

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