If you’ve ever considered changing carriers, take a read of the linked article. There’s a lot of good detail, but here’s the bottom line:

For a single line, unlimited talk and text with 500 MB of data costs $25 per month, with various tiers up to $60 per month for unlimited everything. You can have up to three lines, and with three lines, each person gets unlimited talk, text, and data for $30 per month or $90 per month total. Not too shabby. I’ve been paying $130 per month for three lines of lousy Verizon service, and that’s with a 19% state employee discount my wife gets for being a teacher.

There are a few caveats, but nothing truly problematic. If you are considering such a move, take the time to read Josh’s article.