Protonmail is an encrypted email based in Switzerland. Very privacy focused. No ads. They don’t even ask your name for the free version. They are rolling out a calendar app in beta.
Don’t know of a completely secure texting app. TextFree lets you get a noncell number, but you use their app, and it loaded with ads. Let me know if you find one.
I heard PM was putting out calendar, didn’t hear it was released now. Thanks.
Since you ask, I will try and remember to let you know if I find something I can recommend .