I'm in a similar position to you, probably 80% of my phone calls (outbound) are international. I have a 'deal' from many years ago, no longer available to new entrants, and they keep trying to tempt me off it with speeds that I don't need, without mentioning the loss of the 'free' international calls.
My broadband is laughably slow, apparently, but is quite adequate for me - and I do remember dial-up...