[3333.69 15:56:52] open /dev/wwan0at0
[3333.70 15:56:52] > AT
[3333.71 15:56:52] < AT

[3333.71 15:56:52] < OK
[3336.71 15:56:55] > AT+CEREG?
[3336.72 15:56:55] < AT+CEREG?

[3336.72 15:56:55] < +CEREG: 0,2
[3336.72 15:56:55] < 
[3336.73 15:56:55] < OK
[3339.72 15:56:58] > AT+CGREG?
[3339.72 15:56:58] < AT+CGREG?

[3339.73 15:56:58] < +CGREG: 0,2
[3339.73 15:56:58] < 
[3339.73 15:56:58] < OK
[3342.73 15:57:01] > AT+CREG?
[3342.73 15:57:01] < AT+CREG?

[3342.74 15:57:01] < +CREG: 0,2
[3342.74 15:57:01] < 
[3342.74 15:57:01] < OK
[3345.74 15:57:04] > AT+CGATT?
[3345.75 15:57:04] < AT+CGATT?

[3345.75 15:57:04] < +CGATT: 0
[3345.75 15:57:04] < 
[3345.76 15:57:04] < OK
[3348.74 15:57:07] > AT+COPS?
[3348.75 15:57:07] < AT+COPS?

[3348.75 15:57:07] < +COPS: 0
[3348.76 15:57:07] < 
[3348.76 15:57:07] < OK
[3351.75 15:57:10] > AT+CEER
[3351.76 15:57:10] < AT+CEER

[3351.76 15:57:10] < +CEER: EMM attach failed
[3351.77 15:57:10] < 
[3351.77 15:57:10] < OK
[3356.77 15:57:15] closed /dev/wwan0at0