How to find my lost iphone no app instaled

The only way to find a lost iOS device is to use the Find my iPhone app or www.icloud.com. For this to work, you have to enable this feature on the device prior to loss. If you didn't do this, there is no way to find it. Neither Apple nor your carrier will find it for you.

Setup Find my iPhone:

http://support.apple.com/kb/PH2697

Here's a good tip from Kappy on what to do if you device is lost or stolen:

https://discussions.apple.com/docs/DOC-3362

Sorry no, you have to physically look for it.

Lost or Stolen

http://support.apple.com/kb/HT2526

The only way to locate/disable/erase any lost/stolen iPhone is through Find My Phone or a similar app. However, this requires that Find My Phone be setup/activated, on your phone, before it was lost/stolen. You would then login at iCloud.com & try to locate it. This requires the phone be turned on & have an Internet connection. There is no other way to locate a lost/stolen iPhone. Apple can't/won't help you, nor will your carrier. Report the loss to the Police, your carrier & Insurance company. Change all of your passwords.

If your carrier offers Blacklisting & they Blacklist the phone, it will be unusable as a phone.

If locked with a passcode, all a thief or whoever finds it has to do is force the phone into recovery mode & restore it. While this deletes all data on the phone, it also removes the passcode so the phone can then be used as a phone or touch.