If you don't need a phone then just go without for a week
Probably a gophone, since that is ATT. Easiest if you get one that uses the same sized SIM card, so you can just transfer it. If you need a SIM adapter, by the time you order and receive it, it will be half way through the week.
Luckily, I have old phones available, and adapters, so I gave my iPhone 5 away 2 weeks ago and just been using a Nexus during the in between period.