When does a new data plan for AT&T become affective?

Question

If I update my data plan for AT&T to unlimited, when does this take effect? I don't want to start going on the Media Net and then be billed like $30 for it. My billing period is on the 7th, which is tomorrow. If I change the plan tonight, will I be charged for it on the bill tomorrow? Should I just wait until the 8th to be safe?

Answer 1

I would suggest you post that question to AT&T directly.  I don't think anyone here is capable of answering that unless they work for AT&T and know what kind of contract you have.