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Hello. Changing the telephone number on your line if you believe it is tapped by law enforcement does not affect the tap on the line. A wiretap is not initiated through the telephone number -- it is initiated through the wiring itself -- so no matter how many times you change your telephone number the wiretap will still be in place unless law enforcement removes it.
If you use the same cellphone and simply change the telephone number, the wiretap is on the actual cellphone and not the number, so the change of a cellphone number will not affect the wiretap. If you purchase a different cellphone using a different cellphone company, the wire tap will not automatically transfer -- but law enforcement must have the cellphone carrier initiate a wiretap on that new cellphone. If you change the cellphone but not the company (carrier), then the law enforcement warrant that they have will be easily transferred to the new cellphone that you are carrying becuase they have already established with the carrier that they have a warrant to tap your cellphone -- it will just be a matter of the carrier changing the tap from one cellphone to another. But, if you go and get a new phone and new cellphone carrier company, then it will take some time for the law enforcement to get the warrant to your new cellphone carrier and begin the wiretap with the new company (it will not stop law enforcement wiretap of your phones if they are so inclined to have the wiretaps -- it will just slow them down for a few days while they catch up to your change in cellphones and carriers).