I also have a call connection charge - it's 0p!  I don't make landline calls at all during the charging period.  I use my mobile with Giffgaff which gives me 500 minutes plus unlimited texts for £10 per month - more than enough for my needs.

I cannot believe the stupidity of BT (and other telecom providers) who must be losing literally millions by having and increasing these so-called connection charges.

One day the penny will drop - but they may get charged 15p before it does!