Gsm sim300 - cms error:515

[KEERTHANA.S]

Hi,
am able to send sms from sim900. but i am not able to send sms from sim 300 using the same sim.. when i tried it with sim300,
i.e at+cmgs="xxxxxxxxxx"
> hai
+cms error:515..
what is the solution for it

 

[embRTS]

Try the following sequence

AT+CMGF=1 ;;As u have used in sim900 also
Now try this 
AT+CSCA="+XXXXXXX"  //Set your SMS Center's number, you have to check with your provider about this number
And then Finally Do 
AT+CMGS="number"