Searching does not mean finding... a car without gas does not run either... However, someone could have very well "borrowed" it and used it, in which case the battery is recharged and curiously, the authorized people should be able to find it...
But if it is really lost... in a sewer... it will discharge in two days, it won't work at all and it will become impossible to find it. There are no miracles in these things...
You call this phone number ... and listen carefully to where it rings ... worst case, you'll get the voicemail ...
As for the IMEI ... don't count too much on it in your country where the police don't even have a computer ... I'm not even sure that ISPs have the IMEI list of their clients ...
Understand well, that in France, you can't do it either, only the police have these means, and even then, it requires a judge's commission ...
Read carefully what has already been said on the subject, it also applies to your case... It's not possible in a simple way, at least the police need to be involved.
It's true for the police, but not for you... it's a matter of means... and they can access the ISP's servers, not you... it can't be done from a phone.
However, someone could have very well "borrowed" it and used it, in which case the battery is recharged and curiously, the authorized people should be able to find it...
But if it is really lost... in a sewer... it will discharge in two days, it won't work at all and it will become impossible to find it.
There are no miracles in these things...