My phone lets me call, but not text?

I can call with my iPhone, but not text. When i go to settings > iMessages > Send & Receive, under "YOU CAN BE REACHED BY IMESSAGE AT" it says my number in grey letters, so it is not enabled. I got my SIM card from a seven eleven:/ ?

Your SIM card, your wireless carrier, doesn't have short message service (SMS), which is how texts are sent. SMS is a premium service that you pay for separately from wireless providers, much like Internet and data are separate services. That wireless service provider's SIM card apparently only provides you with analog voice service.

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