Your on GPRS, Which is pretty slow, is there no 4g LTE coverage at your home? Are your APN settings properly entered? I get this all the time at work.
Your APN settings should be
fast.t-mobile.com
MMSC = http://mms.msg.eng.t-mobile.com/mms/wapenc
MCC = 310
MNC = 260
APN type = default, supl, mms
APN protocol = IPv4/IPv6