Best answer by Mayumi
They are offering "U.S. Unlimited Text" Add-ons.
$10 for 3 days
$15 for 10days
Or If you don't use too much texts, you can go with Pay-per-Use
$5 for 100 Outgoing texts(incoming is free).
-This means if you send 1 text, then you get $5 charge and next 99 texts will be covered.