Thank you for your reply (please don’t take it the wrong way) but NO, I’m not adding another application (as with instant messaging, the aim is to keep SMS/RCS + 1 other to a minimum).
So since Mail Basic at 2.90 doesn’t seem very useful (no advertising but I use much more application than webmail which has advertising) because no immediate synchronisation Swisscom contact & calendar with e.g. Google phone or other, I can continue as now (free mail light I’m only at 30% of the maximum because I delete old useless mail and don’t need several mail addresses).
That is to say priority agenda and Google contact that works with phone and instant messaging and when rarely new contact, I double on Swisscom contact.
I don’t know if you could take just 2~3 months mail basic by paying to test and then remove if not very useful.
Thanks to all!