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Need help with networkmanager

#1

i am trying to use my LTE data service i have through T-Mobile.
but it only ever works in umts, not LTE.
here’s my network manager .nmconnection file.

[connection]
id=T-Mobile LTE 1
uuid=0aba9017-93eb-463b-a61b-5afbbcc053a3
type=gsm
autoconnect=false

   [gsm]
   apn=fast.t-mobile.com
number=*99#
password-flags=1

[ipv4]
dns-search=
method=auto

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
ip6-privacy=0
method=auto

“mmcli -m 0” shows that the access tech is always umts. how do i force it to use LTE?
my modem is the Dell Wireless 5808 Gobi? 4G LTE Mobile Broadband Card
my distro is debian 10 buster

i know that old versions of networkmanager used to have a “network-type” option that was used for just this. but it seems this option was removed for some reason.

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