Have you checked the signal | Microcontroller › Arduino › Interfacing of GSM SIM908 and arduino mega 2560 › Have you checked the signal March 8, 2014 at 4:43 pm #11247 Ganesh SelvarajParticipant Have you checked the signal strength? (Using AT+CSQ) ….. i once had a faulty modem whose signal drops after using it for a while (like 5 min.) and that happened with some specific SIM cards
