1. Email capability (SMTP,POP3)
2. IP socket capability
3. User define port number
4. Faster data transfer
5. Support automatic DNS (no need to set DNS)
6. Pin out and all commands are compatible to ver.3
7. Modem's baud rate detect command
8. Status LEDs. showing Connected & Data transfering
9. Data counter command for checking amount of data
10. Extend data sending's length up to 1 Kbytes