True that in practice, T-Mo doesn't always refer to & follow their own fine prints, 50 MB cap for domestic data roaming is not necessary capped at 2G/Edge speed also apply to international roaming, but it is at 2G/Edge speed. Different users consume different amount of data and also depending on their devices (tablets & smartphone, etc.) managed & metered data usage. With a tweaked Nexus 5, I'm consistently under 1 GB monthly, mostly in the 600 to 750 MB range - unless I'm streaming lots of vidoes.

As noted in post above, T-Mo's system is supposed to track tethering and roaming, and when limits are exceeded - restrictions & caps are to be kicked in. Customer could get a friendly notice/warning and/or billed for excess usage, etc. - often, nothing happened but they reserved all rights.

For overseas/foreign business travel, I can "expense" the costs in the billing report - far cheaper than hotel's daily surcharges when it isn't free or inclusive - and for repeated visits, I would go for a local Sim card, cheaper with faster/more data, and the vendors are usually very helpful in the initial setup.

For T-Mo watchers, a new $80 prepaid plan just rolled out, with up to 5 GB of tethering data permitted - plus unlimited calling & texting, but no international options. More "innovative" offers are forthcoming from T-Mo so stay tuned & keep checking their sites for new promo's.