Sim900 airtel sim problem

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rmrps

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Hi Friends i am using sim900 module to send and receive message if i am inserting airtel h2 type simcard when sending sms it sends some extra Junk Characters if i am inserting airtel normal old simcard and all other simcard it was working fine no extra characters i am giving the example of junk characters below
ID:12014 M/S:GRI
D DROP.üðððððððð
ðððððððððððððððð
ðððððððððððððððð
ðððð..+CMGS: 6..
..OK..
Click to expand...
the normal perfect Output is

ID:12014 M/S:GRI
D DROP...+CMGS:
6....OK..
Click to expand...
Please give me your guidance to resolve this issue
 
Last edited by a moderator:

connect your modem with adaptor and simultaneously with the microcontroller, leave it ON and try after some time.
 

ashu840 said:
connect your modem with adaptor and simultaneously with the microcontroller, leave it ON and try after some time.
Click to expand...

Thanks for the reply i am tried but the extra characters coming only sending sms and startup of module when registering to the network and if any incoming calls ariving
 

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