In a year from now, the chart that you see below you might be out-of-date. After the news broke that AT&T would be acquiring T-Mobile USA, one of the first concerns was if T-Mobile customers would be able to keep their plans. Thankfully,T-Mobile has released an FAQ that answered just that--T-Mobile will keep things as they are for about 12 months, and any agreement you enter into in the meantime will be honored once the changeover goes through.

But we wanted to see just exactly what T-Mobile customers might be giving up in terms of monthly cost. We've always admired T-Mobile's competitive pricing when compared with AT&T, and it doesn't help that AT&T removed its unlimited data option last year. We're hoping that AT&T might adopt some of T-Mobile's pricing strategies to compete against Verizon Wireless and Sprint Nextel if the takeover is indeed approved.

For regulatory and spectrum issues, check out Maggie Reardon's insightful post, and for other potential effects, read Kent German's thorough analysis.

Here's a quick and simple comparison chart of the cheapest and most expensive bundles of the two carriers that we took from an earlier price chart, plus additional information for non-smartphones. It doesn't represent family plans, and we couldn't dig up enough information about T-Mobile's Even More Plus plans to include those here--the Even More Plus plans are for T-Mobile customers who paid full price for the phone so they can pay less over time. We did, however, find out that Even More Plus customers paid $79.99 a month for unlimited everything, which is a good $20 less than regular Even More customers.

UPDATE: A helpful reader pointed out the Even More Plus plans to us. We've included them below.

Do note that AT&T does allow for rollover minutes, and it has recently implemented an Any Mobile Number plan that allows you to make unlimited calls to any cell phone regardless of carrier.

Spot any mistakes Have any additional thoughts on the T-Mobile-AT&T deal Let us know in the comments.