It could be the phone or a network fault apparently. The sms validity is at least 30 days unless the sender deliberately sets it otherwise.
To work out which, can you do the following?
When you got the new micro SIM I assume it came in a sort of frame or adaptor which means it could be used in a phone which requires a full size SIM - i.e. your old phone.
If so, could you please put the Micro SIM in the adapter, into the old phone. Then send it an SMS when it is off, and turn it on to see if you receive the text.
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