You can use your iPiPi.com account to originate text messages to your friends or groups of friends directly from your SMS phone.
Step 1 (in your ipipi.com account): Register your phone.
Step 3 (from your phone): Send your message TO the gateway number.
Step 4 (from your phone): Start your message with the s code text, explained below.
Remember, you need have credits in your account to send SMS from your mobile phone.
Note: sending SMS from your phone counts as an additional transaction subject to a cost of one credit.