Web browsing needs maybe 5mbps, you can change the speed in the Firefox F11? F12? Menu and see.

The real test is downloads. How long do you want to wait for a 1GB file?

You’re not going to like the pinephone, it just isn’t ready for you if you’re asking for notifications on your PC.

The calls are okay AT BEST. SMS/MMS have come a long way and should be okay. Battery life is MAYBE a day, if you’re lucky. Anything beyond that is painful unless you want to spend hours getting it to work with your own code.