Imbroglius
It always shows 4G+ and not 5G on top.
What do I do have now? 5G? Is 4G+ just the way GrapheneOS shows the availiability of 5G?
4G+ shows you're on LTE Advanced which offers some improvements in uplink/downlink speed through carrier aggregation (combination of multiple frequency bands), MIMO (Multiple Input Multiple Output - using multiple antennas on both the phone and the cell tower to send and receive more data simultaneously) - just to name two. But it's still 4G.
If you enable 5G in Settings> Network> Internet> Carrier name> Preferred network type> 5G (recommended) or 5G/LTE only
and your carrier/plan support it, you should see a 5G icon in status bar.