Planet SMS sends FREE, ONE-WAY text message to any phone on the planet with a valid phone number through open SMS gateways *. Planet SMS does not cost anything to send out SMS because it does not use user's SMS plan. The receiver can reply to sender through the email specified. Privacy Notice: Neither your phone nor email is collected by Planet SMS. The information provided is solely used for sending and receiving SMS. * Some mobile carriers do not provide gateway service. Messages may be delayed by the server based on queue size.