I'm not on Tmobile currently but my sprint contract is ending early next month. I was looking into this $30/mo tmobile plan but the walmart page specifically says this, "The $30 Unlimited Web & Text with 100 min talk plan works only with T-Mobile Phones purchased from a Walmart store or from Walmart.com". How would I go about switching to tmobile and getting this plan and transferring my old number from sprint? Also, does one have to keep purchasing these $30/mo prepaid cards from walmart to continue service or can you setup an automatic payment to continue each month?
I have this plan on my Nexus 4, which I bought when I decided to leave Sprint. I didn't do any of it through Walmart. If you look at the T-Mobile prepaid plans page, it says "This plan is only available for devices purchased from Wal-Mart or devices
activated on T-Mobile.com". I got the N4 via Google, then bought a sim online from Tmo (they were running a special at the time and it was something like 99 cents) and then activated it online. My experience is here:
http://forums.androidcentral.com/google-nexus-4/259688-phone-sim-here-what-right-steps-now-tm-30-plan.html.
You can buy the $30 cards almost anywhere, or pay online, or set up automatic payment. (Caution for some reason autopayment only bothered to debit my account correctly once out of about 4-5 times and kept resetting itself to non-auto, so I gave up).
Here is the cool thing that I found though - you can buy the cards at Target where they are periodically on sale for something like a dollar or so off. And if you have a Target Red Card, they'll take off 5%. And here is what I discovered recently, although I don't know how long they will do this - I bought a card from Target.com with the red card so got that discount and free delivery, plus they didn't charge the 911 tax that my state recently implemented
and they didn't charge sales tax. I mention that because when I renewed online through the TMo site, they charged both taxes, and when I bought in the Target store, they charged sales, but not 911 tax. I have no idea why they wouldn't charge sales tax online, but according to some other remarks I saw online, apparently that works in some but not all states. So I think I figured I ended up saving almost $4 - not a huge amount, but I get a kick out of it. (And figure it's a free latte

).