We have tried changing the modems and the SIM cards, but the problem persists. The LED on the modem which normally blinks, stays ON all the time. After a few hours of operation (usually 12-24 hours) the modem becomes unresponsive for no apparent reason. The modems are connected via the serial port. We have two wavecom fastrack M1306B-PP gsm modems which we use in NowSMS.
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