I rebooted the device, it established a data connection (H symbol in the
indicator) then after less than 5 minutes it disconnected

$ nmcli d
DEVICE   TYPE      STATE         CONNECTION 
ril_0    gsm       disconnected  --         
ril_1    gsm       unavailable   --         
ifb0     ifb       unmanaged     --         
ifb1     ifb       unmanaged     --         
lo       loopback  unmanaged     --         
ip6tnl0  unknown   unmanaged     --         
sit0     unknown   unmanaged     --         
tunl0    unknown   unmanaged     --         
ccmni0   wifi      unmanaged     --         
ccmni1   wifi      unmanaged     --         
ccmni2   wifi      unmanaged     --         

** Changed in: network-manager (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1425987

Title:
  Cellular data connection stops after a while

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