Ominous message from Piranha Mobile re:AT&T in USA

[rfranzq]

Have T-Mobile's data rates always been better than AT&T's on Piranha?

Anyway, if you are in the USA and do not have access to Piranha's
website it is possible to change the 'profile' so you can change networks
from your phone.

Culled and edited from the User Guide:

j.Change roaming profiles.
Changing roaming profiles will give the user access to alternative networks in the US.
You can either change via your on-line account or by SMS protocol.
To change via SMS, text PROFILE to 222, this will return a list of profiles
or to change directly text 316 to 222 to change to profile AT&T (US).
For default/standard profile, text 315 to 222.

And yes they charge to send SMS.
I was not able to do the 'profile' method.
The direct method did work.