International Call forwarding

[davidtheprof]

I'm starting a thread on this because I'm increasingly relying on just a couple of sim cards for international travel, Piranha, Truphone, and now my US Tmobile phone with free data roaming and cheap calls almost anywhere.

But I'm left with problem of giving friends and family a local number when I visit a country, so they don't have to make international calls from their phones, esp. mobiles.
Piranha will add a local number for many countries, Truphone for a few, but a bit of a pain to call them to set up, then deactivate, etc.

There are call forwarding services like globalcallforwarding.com that cost $10/month, around 7c/min for countries I'm interested in, but also need set up and cancelling.

Another option is Keku, no set up fee, and much cheaper rates, but I'd have to register each person's phone who I want to be able to use the local number. feasible if only a few in each country...

other ideas?