If you never enabled Find My Iphone and want to try to track your iphone using IMEI number this website can do that: iphonetrace.
If you have lost your phone with an Idea SIM card and you have the IMEI number, you can contact your mobile service provider, Idea, and provide them with the IMEI number. They can track the phone using this unique identifier. Additionally, you can also report the loss to the police and provide them with the IMEI number for further assistance in tracking your phone. Remember to also remotely lock or erase the data on your phone using tracking apps or services like Find My iPhone or Google's Find My Device to protect your personal information.
The IMEI code will be useless if a serial number is not known. If a serial number is known, then a call to apple support is warranted, and they can set the direction to begin locating the device.
the police will ask you for the IMEI number to help find you find your phone. So yes, it can help to find your phone (:
Here are the 4-methods to change IMEI on any Android device. This methods will work most of the devices. If you lost your IMEI number, then you will loose Network signal. You may facing this issue while rooting your device or Upgrading OS or Installing Custom ROMs.  Below guide will help you to fix IMEI or Invalid IMEI or even you change the IMEI number temporarily. These methods are working with or without Root Android device.
no as this can damage the cell
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It depends !... If the phone has simply been reported as 'missing', chances are it will still be usable. If it's been blocked by using the IMEI number - it cannot be used.
Call your service provider. On their billing system, they can cross reference your phone number with the serial number of the sim card as well as the imei of the phone, so by proving your phone number they should be able to find the imei.
to track it if its lost call it and follow the noise of the ringing from the phone
yup.. it is possible nowadays because of the stunning improvements in remote communication and location sensory devices. it is possible to track a mobile device even when the mobile is switched off.The only way to stop it is remove your battery or wrap the phone in a aluminium foil ...this is because of the latest invention of the signals created by the sub-atomic particles in the chipsets...it is recently developed by the FBI and MIT.They can even activate your phone as microphone ,hearing your conversations and this process is called as roving bug! when the phone is stolen or lost ..the last used sim shows the imei number of the phone (even if you don't know the imei number....)
He lost track! Get it?
Using the cell phone will depend on various factors; quality of the phone, any SIM card requirements, etc; As long as the carrier does not have the IMEI number showing as lost or stolen, it shouldn't be a problem.