error, SIM 900 PS busy

[hasmibaih]

hi every one ,
i got problem with my sim 900,
when i try to using it for sms gateway in my sim 900, the respon was error, PS busy
when i check with AT+CSQ, the signal value was always 1 until 10
a few days ago, i can use it for sms gateway
why my sim 900 respon was error, PS busy?
help me please sir

thanks

 

[embRTS]

May be there would be a network problem check for the same simCARD by using it in your Mobile and try to send the message?