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There is no such thing! They limit the unlimited sms plan to 1000 free SMS which is LIMITED.
The Raspberry PI 2 (Raspbian - Debian Wheezy 2015) will not detect the TP-LINK TL-WN725N on a fresh install. Even lsusb will not show the TP-LINK WIFI device until you install the drivers. It was a lot of running around to figure this out and while the guys at the Raspberry forums are very technically inclined, they were not able to explain this in over 29 pages of chatter.
tar xzf 8188eu-v7-20150212.tar.gz
Go to GUI and look for WIFI manager and set up your network accordingly :)