yeah. Whatever you do do NOT activate online or over the phone. you WILL lose unlimited. No they didnt even blink when I handed them my phone that was rooted and unlocked running JBSourcery. Just tell them you bought the phone online and need it activated. And you want it activated as a customer purchased device.
I have 3 lines. I transferred the upgrade to the last line and bought the phone. They sent me the phone in the mail. I took it home, conditioned the battery, unlocked the boot loader, flashed jbsourcery, took the phone in to the store. Told him I wanted it activated on my line and that I bought it online. Made it clear I wanted to keep my data package. He activated it as a customer purchased phone. I went on my way.