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Gateway is not sending messages. Modem log reports Status = 350


If you experience the following problem:

(example of modem log entry):
Tue 2021/01/04 00:20:12 gammu-smsd[11255]: SMS sent on device: "/dev/ttySMSA0" status=350, reference=-1

Error 350 means that the message was rejected by a cellular operator. Possible reasons:

  • destination phone number is invalid
  • no credits on prepaid SIM card
  • cellular operator has blocked a SIM card
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