zebra tc75x -> sim card phone number is blank ?

Hello all,

we have a lot of zebra tc75x under android 6 and 7

all device are a sim card, and we use mobicontrol as a MDM and i would like to have the phone number in the console of mobicontrol ..

but the information still blank.

I've open a ticket on soti mobicontrol but they tell me to contact zebra and see if something can be done ...

Someone can tell me, how i can do for to have my phone number visible on my device (setting / about phone / status / sim status / my phone number -> still EMPTY

Any help would be appreciate