usually top up my mobile at the ATM, forgot to do so and ended up buying a voucher.
I forgot that I need to use Fn every single bleeping time to enter a number
(or I've missed something in the instructions from yonks ago)
Sent text with voucher number, received text saying the number hadn't been recognised, aaaaaarg.
Back to the Fn again and this time all went well.
Why on earth are vouchers printed in such tiny digits that it's not easy to tell the difference between a Zero and an Eight? :-D