I am using Zoom for various different reasons..
Re the question of cost: My understanding is that a one to one is not subject to the 40 minutes restriction. This is one unit (as in iPad) to another unit there could be two or more of you on that unit.
It is only when it is multiple units connecting, that the 40 minutes applies - or the licence fee is paid, in which case no time restriction.
We had a Memorial talk for a friend who sadly died just before lockdown. Friends from all over, including US and Australia were able to link in. Once you've tried it a couple of times you wonder what we did without it! I have friends in their late 80s using it! (Very useful for keeping in touch with those who have been shielding too)
FS