After a few days of testing, I notice that LineageOS has significant trouble on my phone with Mobile data. I have the modem version as is mentioned in the post I reply to, so I think the modem files are up to date. My Lineage version is of 3 august, so that’s up to date as well.
Messaging and mails in general work, but anything more bandwith heavy (even simple web browsing) just refuses to load (not slow but time-outs and ‘no network’ errors). Also my VPN (TCP connection) is unable to connect under mobile data, while it works fine with Wifi. Under FPOOS my vpn never had any issue connecting to mobile networks.
Btw, the icon in the status bar sometimes has a small X, but other times just shows a healthy graph with LTE above it while the symptoms appear (No X or other additions). So this doesn’t seem to reliably indicate that there is an issue. I also tried turning airplane mode on and off. Sometimes it works a bit, but does not solve the issue completely.
Anybody knows something I can try to debug this? Is anyone else having this much trouble with mobile data?