The TomTom 6250 has an integrated SIM card for TomTom Live Traffic. With the TomTom 620, this function can only be used via a connection with a smartphone.
Unfortunately, we do not have any personal user experience with this product, but I would be happy to forward your question to the Community, perhaps a Community member will be able to help you 😊.
Hello, you can download so-called Points of Interest (POI) to the device. You will find a large selection via your search engine.
The TomTom website explains exactly how to do this.
Routes created in MyDrive can be transferred easily (e.g. via WIFI). Routes can be exported from GoogleMaps in KML or KMZ format. Whether these can then be converted into a suitable format for TomTom Go, I do not know.
Swissproblem.... Swisscom - apparently TomTom's communications partner - is discontinuing 2G. Devices that are still based on this outdated technology no longer work.
I assume that you can use your mobile phone as a hotspot and transfer the information to the TomTom.