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Have you been in contact with your cellular service carrier? You need to notify them that your previous phone was lost so they can a) put that phone's IMEI on a centralized block list so it no longer has any future cellular service, and b) cancel your account on that phone (essentially deactivating your account service on the SIM card in that phone).
You'll probably need to set up a new account, with a new phone number.
 
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