I need to get our church's phone number ported to a VoIP service (or other phone service that provides call forwarding) before I leave in a month's time.  The objective is to have the number still attached to an account the church holds, and to have it forwarded to one of our member's landlines.  In a pinch I could pull an ATA out of my junk pile and set that up in someone's house.

We need a provider who sends bills (email is fine), not prepay.  And they need a callcentre capable of answering "can you change our call forwarding to 03614xxxx" type calls too.  The people who would call the call centre are all in their seventies or eighties and definitely not techies (mostly retired farmers).

I was all set to sign up to the old WxC VFX service - it would have ticked all the boxes - but it's not available to new customers.  Hero or 2Talk would be OK if they weren't prepay.