I noticed from the Settings > SIM card > Preferred Network Type that the standard 2G / 3G / 4G are not available, I have lots of other choices instead (see attached image): GSM / LTE / CDMA.
Are these network types the only choice in LineageOS?
The top two choices shown with LTE would/should be the equivalent of 4G. So if you’re data icon in the status bar shows LTE then you have 4G (LTE and HSPA+ are 4G technologies).
You should be good to go. Not sure about the speed issues though.
The internet speed from my 4G sim card is a lot slower and sending images or updating apps is a lot more difficult.
I am wondering if this happened to other users too.
Not sure how to troubleshoot that. Maybe check the APN settings for your provider. If in your APN settings you see IPv4/IPv6, maybe try changing it to just IPv6 or IPv4 (if still supported by your carrier). On all of my ROMs I still use the latter. T-Mobile in the U.S.
As far as other users input, specify details so those with a matching setup can chime in. Device, /e/OS build, carrier used, etc.
Regarding Preferred Network Type, I have a lot of choices. Where Global is available I usually choose that over GSM/WCDMA/LTE or even just LTE.
Try out a few things and see if anything improves.
Thanks for your awesome support, I noticed today that it was another wrong analysis from me (my bad again).
I used the LTE from another area and the internet speed was very fast (like 4G before switching to /e/.