Messages on Ipad Air on T-mobile doesn't work

I have a cellular-capable iPad Air running iOS 8.1. When T-mobile had their 200mb per month for free promotion a while back, I jumped at the opportunity and got one of their SIM cards and activated the promotion. I have been using this data since then when I am on the go.

My problem is that Messages/iMessage has never worked while using T-mobile cellular data. I can neither send nor receive messages, but when I am on Wi-fi data, it is fine. Other apps that use data work fine.

Any advice on how to fix this?

I was able to solve my problem by doing this: I went to Settings >> General >> Reset >> Reset Network Settings. Messages has worked fine every since, regardless of whether I am on Wi-Fi or Cellular.

Hope this helps someone else!