Choosing 3G or EDGE on Mobile Broadband in ubuntu 17.10

open terminal

type

 sudo chmod -R ugo+rw /etc/NetworkManager/system-connections

press enter after that just go to the folder  etc/NetworkManager/system-connections


According to the documentation it is possible to force 3G with the parameter network-type:
Following Options are available for the parameter network-type
  • -1 any connection (Default value)
  • 0 for Only 3G
  • 1 for GPRS/EDGE only
  • 2 prefer 3G
  • 3 prefer 2G
These changes have to made in /etc/NetworkManager/system-connections/your_3g_connection. Put network-type 0 in the section [gsm]
Option 0 is what you requested, but I would recommend using 2. If your signal is too weak for 3G, you'll have no connection at all with the setting 0. Whereas the option 2 will go down to EDGE/GPRS in that case. Better 2G than nothing at all, isn't it?
 

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