How to Text Message A Sprint Phone For Free Using Gmail
If your cellphone plan doesn't include free text messages -- or it doesn't include enough of them -- save some cash by sending text messages through a free email account such as Gmail. You'll still pay to receive text messages, but sending them won't cost you a penny. To send a text message by Gmail, you need to know the service provider of your recipient's cellphone; then you can use a special email address format to send messages.
Log in to your Gmail account by going to mail.google.com.
Compose a new email as usual, but limit the message text to 160 characters.
Instead of entering a regular email address, type in the phone number of the SprintPCS customer followed by "@messaging.sprintpcs.com." If the number is 543-543-5432, for example, the text address would look like this: "email@example.com."