Hayes AT Command Set ==================== A/ Re-execute last command ATA Answer incoming call ATD Dial number. The number can include the following dial modifiers: T Tone dial P Pulse dial W Wait for dial tone , Pause for about 1/3 second ; Return to command mode after dialing, must be last character ! Hook flash/Recall. The modem will go on-hook for 0.5s. ATE0 Disable echo ATE1 Enable echo ATH0 Hang up to disconnect ATH1 Off-hook to connect ATI0 Info: product code ATI1 Info: ROM checksum value ATI2 Info: ROM checksum text ATO0 Go Online ATO1 Go Offline ATQ0 Enable response messages ATQ1 Disable response message (Quiet) ATZ0 Reset modem After dialing and connecting, the modem will enter data mode. To return from data mode to command mode, wait one second, type +++ within one second, and then wait one second again.