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even we got the same error
first we tried with the AIRTEL sim everything worked fine except sending message then we changed the sim to BSNL message sending worked but no other functions worked.
then my senior gave another same gsm module board . every thing worked just fine.
i think problem was...
even we encountered same problem.
first we tried with AIRTEL sim every other functions like call, message recieving worked fine but when we tried to send message we got CMS ERROR 515 and then we changed sim to BSNL then we could send message but call was not working.
then my seniors gave me...
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