Just to let users of this forum know that you can currently call a Spanish mobile from a UK landline for 3p a minute, at all times, by using www.0844calls.co.uk. First dial their cheap access number: 0844 439 98 98. Once connected, key 0034 and the spanish mobile number you want to connect to,followed by the hash key. :)

It is also worth remembering, for those on O2 pay monthly contracts, that you can use your monthly allowances to call 0844 numbers, at no extra cost.(This ONLY applies to O2 pay monthly customers - all other networks charge extra to call these numbers.)