sim900a sms take long time to arrive

Question

i have trouble with my SIM900A GSM
i can send one SMS successfully ("arrived in less than one minute")
but when i send another SMS after first one (delay more than one minute "it's not for bulk purpose") the second message take about 15 minutes or more to arrive to destination device.

in the same time i'm sending sms my phone to the same destination it's arrive directly all sim-card from the same operator

i have powered the gsm with 5v,2A power so i have no power problem.

any suggestion will be great

i'm using arduino
this my code :

Serial3.println("AT+CMGF=1"); 
delay(1000);
Serial3.println("AT+CMGS=\"+96279XXXXXX\""); 
delay(1500);
Serial3.println("my message");
delay(1000);
Serial3.println((char)26);
delay(1000); 
Serial3.println();
delay(5000);

dmSherazi dmSherazi · Accepted Answer · 2015-03-31T13:59:16

It seems that it is an issue related to network. Try switching to another network.

As far as the modem accepts your request for sending sms and replies back with +CMGS response including the a number, it has performed its job well.

SMS are not meant to be a real time communication and operators delay them due to several reasons.

sim900a sms take long time to arrive

1 Answers