I just moved back to Tenerife after living in the US for the past six years and was looking for a cheap way to call the US and UK from my mobile and came across Hits Mobile. I’m now calling the UK for 5.3c a min to landlines and the US for 5.3c a min to any phone. The best thing is international texts which are just 39c, the cheapest i’ve found. I got mine from a place called Direct Telecom. It uses the Vodaphone network and I havnt lost coverage yet, oh and all calls to other hits mobiles are free and only 7c a min to people on other providers.
If anyone has anything cheaper please let me know.