Originally Posted by
txrandom
I'm in Seoul. I've only been able to connect to SKT. On my iPhone 5s, data didn't work until I disabled LTE. Speeds are fine for basic browsing, but I'm unable to reliably stream music from Google Play.
I've never dug in to the Cellular settings on the 5s, but it appears that there are many settings which could be tweaked. I take it you didn't pursue the matter with T-Mobile? In my experience the quality of help one can get from T-Mobile varies widely, but perhaps there is some setting which could be changed to get you connected at faster speeds?