You can forward to another number. If you are forwarding to a US telephone number, then expect to spend 2ยข per minute after your plan’s minutes are used up. If you are forwarding to an international number, then rates will be much higher. So while you could forward, it does not make financial senses, especially if you live outside of the US. Most people have a smartphone, and can use a SIP? client to ring your smartphone just by using data.