T Mobile Reviews 

My internet provider was bought by T-Mobile and since then, there have been multiple outages. Customer Service is difficult to reach- today I was on hold for > 1.5 hours. I was able to connect via online chat after a 22 minute wait. There’s no way to cancel a plan online- though the FTC mandates cancellation be as easy as enrollment.
After a very long chat session, a rep told me my cancellation request had been processed and that my service will continue through the paid period.
Two hours later, the wireless connection is gone.

First, I will say that most of the people who work at the T-Mobile store I visited near the main train station in Salzburg (I've interacted with about 5) are fairly nice and speak English well. This was helpful for me as an expat living here and is why I didn't give a one-star review....
The quality of customer service provided is VERY poor. I had a t-mobile SIM card and month-by-month pre-paid plan (not a contract since I won't be here for 2+ years) and went to the store to have them help me understand how it works when it was time to renew or "top up" after the first month ran out. I purchased a "gutschein" (credit basically) for the next month and asked when I could apply it to my account- if I needed to wait until the first month was completely over or if i could add it a few days earlier so I don't have a lapse in service. I was told I could just add it then (a few days early) and there would be no issue. So, i did this, and sure enough a few days later I got a text message telling me I didn't have any more credit on my account (15 Euros down the drain... and actually i also did this for my husband's so it was 30 Euros). When I came back to ask them about this they said there's nothing they can do and that they're sorry if they gave me misinformation but it's out of their control. I asked if I could speak with a manager and they said none were available. I came back three times and this was the response each time. I also called T-Mobile 2 different times regarding this and no one seemed interested in helping me.
The plan also is not very good compared to the competition. You can't use the data outside of Austria... I soon found out many of the competitors do allow you to use the data (at least some of it if not all) when traveling to other European countries. Needless to say after this terrible customer service experience I went with another company (Hofer). Stay away from T-Mobile in Austria. It's such as shame since they are known for having pretty good customer service in the US.

We were receiving text messages from these guys since we are back in Australia, for about one month by now, all night long, every half hour and they do know we are in Australia because they sent us a welcome in Australia message!!!!!!!!!

In addition, they were unacceptably rude when we were in Austria. Men with Austrian accents were putting us down on the phone and shouting at us for no reason other than that they were too lazy to explain some of their settings!!!!!!!!!

Wir bekommen SMS Nachrichten von T Mobile Austria seit wir wieder in Australien sind, das nun schon seit ca. einem Monat, die ganze Nacht lang, jede halbe Stunde und die wissen genau das wir hier sind weil sie uns eine Willkommen in Australien Message geschickt haben!!!!!!!!!

Ausserdem waren die ekelhaft zu uns als wir in Oesterreich waren. Maenner mit oesterreichischen Akzenten haben uns angeschrieen und nieder gemacht, weil sie zu faul waren, um uns ihre eigenen technischen Einstellungen zu erklaeren!!!!!!!!!

They are expensive too - compared to other providers on the Austrian market, such as Hot and all those other cheap providers.

Sie sind zudem teuer im Vergleich zu anderen Anbietern auf dem oesterreichischen Markt wie z.B. Hot und andere billige Anbieter.

The only reason one of us is keeping the bloody T Mobile Austria phone that calls itself Optus now is that one of my close ones wants to stay in touch with an annoying person in Austria, which is hard to understand, but that person is certainly paying a high price for that since T Mobile Austria is waking us up all night every half hour. I am certainly going to ask that person to give up on the phone and perhaps go back to Austria too. Either way, we both suggest that purchasing a T Mobile Austria phone is a biiiiiiiiiiiiiiiiiiiiiiiiiiiig mistake!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1