My having same issue, on and off...sometime had to remove and re-install the sim card. No problem with my friend unit that we bought at some time..
Have to bear with it...
Have to bear with it...

Ever since updated, keep getting the error of SIM1 not installed and it completely unable to recognise the SIM. When turn on and off airplane mode, its able to recognise the SIM again.
Really getting tired of this crap from ASUS.


