Your defiinition of a cheap call and mine seem to be at odds. Ryanair charges anywhere from £0.10 - £1.00/minute from a UK landline
True but slightly misleading. In the UK, a call to reservations costs £1.00/minute. Calling the flight alterations number costs just £0.10p per minute. I think most people would agree that that's cheap (the only reason I didn't list this price in my original post is that I've no idea which country bcn boy is calling from).
I recently had to change a misspelt name on a reservation and Ryanair did it for free. I called from my mobile for convenience, was on the line for less than two minutes and it didn't cost that much (I could always have found a phonebox if I'd wanted to). It's much better to update the information than to take a risk. 99% of the time you'll be fine but it only takes one jobsworth to kick up a fuss then you're left having to falk out for a new flight on the day of departure. Now THAT'S expensive