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Concatenated SMS as someone else mentioned, but there is also USSD: http://en.wikipedia.org/wiki/Unstructured_Supplementary_Serv...

Concatenated SMS. A thing.

The standard allows 255 segments of 134 bytes, for ~39000 7-bit characters (GSM 7-bit alphabet) or ~17000 UCS-2 code units.

fwiw, it's built on Vumi which is Open Source http://github.com/praekelt/vumi. Feel free to join us in #vumi on Free for any questions.

s/Free/Freenode/

Apparently using Vumi.