Hi,
This is my first replacement with the One XL because of this. The guy at T-Mobile offered two solutions for my old phone, one was to take the SIM out and use a hairdryer on the inside of the SIM holder, (personally, I think blowing in it might be enough to remove any dust) or he said that sometimes the SIM cards are a bit loose and to try and put a small bit of thin card on top of the SIM when putting back in so that it is more secure. I must admit the "blasting it with air" was good enough stop any further problems until I had the new one. Will have to wait and see if it happens with this one.
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