I have gone to the T-Mobile store 3 times to try to fix this issue and keep getting the runaround. Nexus 5, not rooted, using 8SMS messenger app. Disabled Hangouts. Periodically I will have trouble sending and receiving texts. First time I called customer service. They had me do some stuff (nothing I hadn't already tried, like clearing cache, rebooting, etc.) and that didn't help the problem. Then I go to the T-Mobile store. They called tech support and took the SIM card out of the phone (which I had already done) and put it back in and sent me on my way. I went back to the store a few weeks later complaining of the same issue. They gave me a new SIM card. Things seemed to be okay until a few days ago. Now I'm having the same trouble. I send texts and people don't receive them. Or they send them to me and I don't get them. I've done every troubleshooting step I can think of. I went back to the T-Mobile store today (the nearest store is about 20 minutes away, so it's a little bit of an effort to get there) and they told me I need to quit using a third party SMS app and use Hangouts. They said it's probably the third party app. I call b.s. I asked for a replacement phone. They said no. They said first we'd need to try factory reset. I told them I tried that already. I ended up leaving the store because it was getting later in the afternoon and I had to beat traffic, which is horrible where I live. Anyway, I am not happy. Plus they have screwed up my EIP, and now owe me over $400 for their mistake. I am beyond upset with T-Mobile. I really don't need this because my husband has been dealing with cancer and this T-Mobile stuff is a silly problem that should have been fixed ages ago. Does anyone have any suggestions as far as the SMS issue goes? I appreciate any help. Thank you.