Lost. My phone how do i stop service and or locate it

Can't get in my phone

If you know your Google account info (if Android) type in on google.com search bar "android device manager" and click on 1st link. Sign in and it will pull up on a map where the phone is if it's on. From there you can lock, erase, and ring your phone (just plays ringtone until you hit the power button and isn't recommended unless it's near you). For iPhone I do not know much about but I assume you could do the same but on apple website. If phone got powered off then you have to wait until the stores open and call yiiur local branch give them your information and they can lock your phone and report it stolen. Hope this helps! And good luck finding your phone.