AOL
 |
AIM Express for AOL; use without installing software |
| AT&T | AT&T text messaging |
| Google SMS (Short Message Service) | |
| ICQ | Free calls (including video calls) and messaging from any device |
| Skype | IM and audio/video calling |
| Sprint | Sprint text messaging |
| T-Mobile | T-Mobile text messaging |
| Verizon | Verizon text messaging |
| Yahoo IM | Communicate via text, video and voice in real time for free |
| IM Info | How instant messaging works |