I was having issues with poor latency/delays and slow connection speeds with TMobile. I called them and they said even though prepaid 4G doesn't have data roaming, if you have data roaming turned off on your phone, it won't get full 4G speeds. I didn't believe them but decided to try it. My speed went from 3mbps to 13mbps! I then had a friend (on an HTC One S) do the same (he also had data roaming off) and he saw the same boost in speed!
** IMPORTANT: for this to work properly with the network, you need to reset the APN to default after turning on data roaming.
(They assured me that we won't get charged for data roaming because the account doesn't have that enabled for other providers)
** IMPORTANT: for this to work properly with the network, you need to reset the APN to default after turning on data roaming.
(They assured me that we won't get charged for data roaming because the account doesn't have that enabled for other providers)