Waze was available on windows mobile, used it last week 
Got a P20 Pro myself as my 930 battery can be dead within half a day just using whatsapp, slowly migrating over but thanks to Vodafone screwing up (and mobiles.co.uk) they've screwed up the contract, screwed up trying to fix it, then ignored attempts to return under 14 day cooling off, not sure if I'm going to keep it now.
I miss having a physical shutter button for the camera, phone feels too slippery in the hand even in a case, nothing to grip on to when using (tiny hands), all my chargers were QI so going back to a cable is strange but at least it charges quick.

Got a P20 Pro myself as my 930 battery can be dead within half a day just using whatsapp, slowly migrating over but thanks to Vodafone screwing up (and mobiles.co.uk) they've screwed up the contract, screwed up trying to fix it, then ignored attempts to return under 14 day cooling off, not sure if I'm going to keep it now.
I miss having a physical shutter button for the camera, phone feels too slippery in the hand even in a case, nothing to grip on to when using (tiny hands), all my chargers were QI so going back to a cable is strange but at least it charges quick.