Is the signal anything like IrDA or the IR used in TV remotes? Just wondering about putting something together with an Arduino. We had a (non-smart) electronic meter fitted last year as a routine replacement.
If you're thinking about jumpering live to neutral, there's a big fuse just before the meter. You'd also have to be unable to tell red from black (brown from blue on new installations).
If you don't have a password/PIN on your phone it is also wide open to drunken antics such as your mates switching your girlfriend's and mum's names around.