Fix your APN.
<apn carrier="T-Mobile US" mcc="310" mnc="260" apn="epc.tmobile.com" user="none" password="none" server="*" mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc" type="default,supl,mms" />
<apn carrier="T-Mobile US LTE" mcc="310" mnc="260" apn="fast.t-mobile.com" user="none" password="none" server="*" mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc" type="default,supl,mms" />
<apn carrier="T-Mobile US LTE IPv6" mcc="310" mnc="260" apn="fast.t-mobile.com" user="none" password="none" server="*" mmsc="http://mms.msg.eng.t-mobile.com/mms/wapenc" type="default,supl,mms" protocol="IPV6" />