qualitythumbs:
Here are some:
http://www.lo-ad.com
http://www.premiumphoneservices.co.uk
http://www.saturncommunications.com
http://www.sintalk.com
http://www.goodthinxxcash.com
There are a good few based in the UK where the phone biz is still doing well - and they do provide/service international lines. I've not got my contact book here.. but check out Goggle under "audiotext".