UK phones can work but it is not worth the hassle in getting them to work. Easier, quicker and cheap to buy a new one here.
There are two problems with UK phones. Firstly the plug size is wrong. a smaller plug is needed. You can get adaptors.
Secondly, the wires are connected in a different order. Something like 2 to 3 and 3 to 2 but not sure. Someone may tell you that you can get an adaptor to change the order but I have not found one.
By the time that you have gone out, got an adaptor, found it does not work because of the diffent wiring, tried to rewire etc, it is easier to buy a phone for under SGD20.
Good luck.