Day and night (and sometimes the rest of the time) : email@example.com
It happens (although very rarely, I don't even know whether it is worth mentioning it) that I don't reply within the next 5 minutes. You will find some possible explanations here
When a discussion is obviously necessary : (33) (0)1 69 07 30 16
It also happens, though about once every other century, that I don't call back within the next 5 minutes. Some possible explanations are here
Do not look for a cellular phone number : up to now I have survived without !