you may need to look at the sim holder see if the prongs that read the sim is to far down you can try to pruy them up a bit....the place the sim back into the phone and see if it reads.
2 - you can reflsh the original firmware back on the phone...you can go to
www.topsony.com and download it from there...this is a pay site.
3 - if none of the above work then you will have to buy a new mobile.
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