Sign up with stealth for new phone purchase?

[ilovesushi]

So I'm being extra careful (yes borderline line paranoid) in separating my legit account and stealth. So for stealth accounts I want to have everything on a second phone to buy.

Some questions

1. Should I do stealth address to sign up for new phone? (I'm not doing just ebay but also google ads etc). Or am I being paranoid.

2. Is metropcs ok? It seems only 10 bucks cheaper so maybe doing tmobile is ok.

I plan on getting a po box address with stealth info as well and billing will go there.