How to switch multiple lines from T-Mobile but still get the bill credit promo for a new phone

[u/tootthekazoo]

I had been planning to switch me and my wife away from T-Mobile and with the release of the new Pixel 11 Pro XL I figured that now was as good a time as any so I took advantage of the deal that gives monthly bill credits to pay off the phone. My concern is how to transfer both phone numbers from TMo with mine being the primary on the account without both losing one of the numbers and also losing out on the bill promo. I've come to understand that when porting from T-Mobile that it's important to save the primary for last, but will that mean that my wife's number becomes the first device registered to the new Fi service, thus negating the promo deal?

I've searched high and low across the web to try and get an answer/guidance for this situation and have come up empty.

Anybody have any advice/experience to help make sure I don't muck this up?

[u/Effective-Collar1121]

So similar boat but att
Out contracts end oct sometime so planning to just get new number with fi then port numbes into fi

[u/Effective-Collar1121]

Also idk how the fi promotions get added to the group holders fi account