How will I get my lost iPhone back?

I lost my iPhone 5 a week ago and I have been asking my mum to call the service provider or even the police pretty much every day since but she still hasn't done anything and there's nothing in my power I can do. I'm pretty sure it has been stolen instead of lost and the person who stole it could be one of the four people I was with (I didn't know any of them very well) on the night I lost it but I really can't remember what happened to it. Let's just say I wasn't in the most stable state of mind and I know I should have been more careful… What should I do? I've run out of solutions:(

Type into google, find my iPhone! It is a service that could pin point the location of you iPhone! I lost my iPhone in a taxi and I used find my iPhone for day but didnt get any signal, because my iPhone was almost dead when I lost it and it had password lock!

Get your mum to ring the service provider and block the phone so it cant be used by anyone else, thats all you can do unless you have insurance which will cover it

Hi, my dear. Please wait for police and carrier search?! Good hope!

If your mum ain't doin anything and you been askin her since it went missing… Maybe she has it

If your iPhone is lost or stolen what do you do? There are things you should do in advance - before you lose it or it's stolen - and some things to do after the fact. Here are some suggestions:
1. Reporting a lost or stolen Apple product:
2. Find My iPhone:
3. Recover data from stolen iphone: