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connecting usb 3g to android

Hello Sir/Mam, I have struck out with a problem in connecting usb 3g to android. so,please help me to find out the solution. 

when i try to run the below command

/system/bin/pppd /dev/ttyUSB0 115200 persist defaultroute usepeerdns updetach crtscts noauth debug connect "/system/xbin/chat -v -s -f /system/etc/ppp/airtel.chat"

it throws me the following statement:

timeout set to 100 seconds                                                      
abort on (BUSY)                                                                 
abort on (NOANSWER)                                                             
abort on (ERROR)                                                                
StartingGPRSconnectscript                                                       
send (ATZ^M)                                                                    
SettingAPN                                                                      
expect (OK)                                                                     
alarm                                                                           
Failed