I was a Sprint customer on-and-off for over 3 years. I ported my number out of Sprint last month (12/2020) to Red Pocket (AT&T network).
I now want to port that number to T-Mobile, on an unused line on my son-in-law's account (he is the PAH).
Note: My spouse has "Full Access" (Administrative privileges)on that account, but is not the PAH.
The account is a Magenta account (SOC code MAGENTA2)
The unused line was added as part of the recent "2020 Line on US 4" promotion on 12/22/2020.
I have the SIM that was ordered as part of that promotion. I want to use that SIM in a paid-off/unlocked Apple iPhone Xr.
Are there any restrictions around porting in my number from Red Pocket over the initially-assigned number that I should be aware of? Perhaps a 90-day waiting period between Sprint && T-Mobile?
I specifically want the port-in to be smooth/routine and do not want the "2020 Line on US 4" line to somehow no longer be free.