Voice on the Go
One of the more popular voice-to-text products out there, Voice on the Go almost lets you do it all: speak text and e-mail messages, Facebook posts and Tweets; listen to, delete, or forward e-mail messages; dial phone numbers with just your voice. You simply call the company's local access number, turn on your headset or switch your phone to loudspeaker mode, and follow the computer prompts. Voice on the Go works with all phones on all networks, and an audio file accompanies each e-mail so recipients can listen if the transcription is unclear.
On the negative side, the system only lets you send text messages - you can't receive any - and you can only text people on your contact list.
The monthly fee is $6.