AT+YZAPN=<apn>,<username>,<password>
example: AT+YZAPN= wlapn.com,password
example: AT+YZAPN= wlapn.com
AT+APN=214028,<apn>,<username>,<password>
example: AT+APN=214028,wlapn.com, password
example : AT+APN=214028,wlapn.com
AT+YZAPN=<apn>,<username>,<password>
example: AT+YZAPN= wlapn.com,password
example: AT+YZAPN= wlapn.com
AT+APN=214028,<apn>,<username>,<password>
example: AT+APN=214028,wlapn.com, password
example : AT+APN=214028,wlapn.com