Huge favor to ask... Could anyone please tell me what the extension is at the end of a Sprint customer's number to send a text or picture message? My friend has Sprint and unless I send from sprint's site---I have no way to send her a message from my computer. Tmobile's is the email@example.com and verizon is number@vzwtxt for text and vzwpix for pictures... but what the heck is Sprints? lol If anyone could help me out I would appreciate it! Thanks so much in advance!