Better to follow the officially approved way.
Get a TF BYOP singleton SIM for a buck or two, will be VZW like your current one.
Put that in your **Unlocked VZW compatible** target phone
in a strong signal area
also have your active Flip up and working.
Login to your MyAccount and Activate the new BYOP SIM, saying you do not want a new line/phone# and enter the number currently serviced by your flip / SIM bundle.
You will be asked to verify the code sent to the Flip.
The Flip then goes inactive, you can turn it off, keep the old SIM with it, you may need it FFR.
Reboot the new phone, maybe every 20 min or overnight, testing 1 Voice 2 SMS 3 Data is working.
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