[grim reaper]

when calling a mobile you get charged from the moment you are connected to the mobile network (before the mobile even rings)

for instance calling an orange mobile which is in the FM4 charge band

connection fee 11.99 pence
standard call charge per minute 13.95 pence(minimum call charge is 1 min)

therefore 11.99 + 13.95 = 25.94 pence

charges are rounded up to the nearest penny ... hence your 26 pence charge