Question about Sony Ericsson Z750i Cellular Phone

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I bought the phone from US. But it has been locked. Showing 'Invalid Sim'. Please help.

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You can get the Unlock code from service provider and Unlock it...

Posted on Aug 10, 2011

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It may be due to network lock,you need to be unlock your phone and use it to another network ,you want to unlock your phone get codes here http://www.superunlockcodes.com/

Posted on Nov 29, 2010

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If you are saying the sim that came with the phone is saying "invalid", then you need to speak to the mobile provider about this.

If you have used the phone successfuly before & this has just started happenning, the only thing I can suggest is to take out the card, make sure the metal contacts on the card & inside the phone are clean, replace it & try again. If still no joy you may have been disconnected by your network.

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