📶Physical SIM #1
This is the main method. It should work for most carriers; T-Mobile, Boost, Google Fi, etc.
This DOES NOT work with Verizon, AT&T or Redpocket as users have reported.
Steps:
Take your active SIM card and put it into your iPhone (Please wait about 10-20 minutes to make sure that Apple has your number registered to iMessage.)
Turn on Airplane Mode, but keep the Wi-Fi on
Take out the active SIM card and replace it with the inactive SIM card
Keep your iPhone always powered on, plugged in and connected to Wi-Fi
Keeping the iPhone always on may not be necessary, I'm currently testing it and I haven't been deregistered yet!
On your Mac, make sure to accept the "new number" being added to your Apple ID
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