Replying here instead of creating a separate issue: For me 2G is completely broken. I can’t use the 2G only mode, which may also explain the network issues after a call. It just tries to connect and fail in a loop. I made a short video demonstrating the issue: https://cloud.neko.dev/s/xWwadtoLnsdARbH
This is on an Xperia 10 II, with 4.2.0.19.
The Ubuntu Touch guys seem to have the same issue (they use the mer ofono too) and one of them shared the following workaround:
We can fix the problem with adding the precise hidl interface: transport=binder:name=slot1;interface=radio@1.1 in the ril-subscription.conf file