Not me, that's for sure!
I dismantled my old 6310i to fit a new facia from eBay, but thought I'd knackered it totally when I'd had to saw through one of the screws which had pulled its retainer out of the housing and wouldn't release. After fitting the new facia, the phone worked OK except in the car kit when it merely whimpered rather pathetically and wouldn't recognise the car kit...
Anyway, with nothing to lose, I've just taken it to bits again and given it a thorough clean, including a blast of dry air to the base connector. Put it back together again carefully; lo and behold I now have a fully serviceable spare phone which works in the car kit as well! I can only guess that there must have been some swarf from the sawn through screw shorting out a pin or two in the base connector.
2 x Nokia 6310i will keep me going for a while - and I've also got my old Motorola Timeport T260 as a last resort.
The replacement facia from eBay wasn't quite up to Nokia quality - neither was it very easy to fit. But it's great to have a good spare phone all the same. There seems to be quite an industry of 6310i refurbishment out there on the Internet.
You can keep the kiddiephones with all their gaudy gimmicks!