@garritfra most of the people has chosen signal. Some others wanted my email in the meanwhile and will check alternative apps (many of those I used to do plain emails/calls back in 2011, actually, the year I signed on WhatsApp).
In general, we've agreed on checking how calls within the EU are charged (anybody knows?), but I've promised myself to be proactive and gtfo of whatever needs to be deleted. If friendships are actually friendships, they'll survive, otw happy to defrag my agenda :)
@kosmoplan On calls within the EU: There's a regulation stating that data- and callplans within the EU must not have an extra fee. I'm from germany myself, and I can keep in touch with my sister via phone whenever she's travelling without paying up.