T-Mobile has had a lot of interesting marketing ideas lately (incl. their free global roaming) and now they are giving you an iPhone 5s with an unlimited contract for 14 days to test out their network.
However, you can also call in using (855) 870‑0904.
I just signed up – let's see what happens…
Some important Terms & Conditions:
….Limit three trials per customer. Return of Phone must be scheduled within 14 days of delivery to avoid a $699.99 per phone and tax being charged to your monthly bill. If you do not return the phone within 14 days of delivery we may bill your account for the full value of the devices. $100 damage fee charged for returned phones that do not power on, have cracked screens or water damage, or active
… 50 MB of data roaming available.