I lost my iPhone 7 plus

This is primarily a user-to-user support forum; other Apple users like you. You can use any computer and log into www.icloud.com/find

to look for it. There is more information and other suggestions in If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

RuigiAniceta wrote:

Can Apple locate for me using the IMEI ? My IPhone is offline each times I check it on fine my iPhone

Sorry, no they won't.

See the following from If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Find My [device] is the only way that you can track or locate a lost or missing device. If Find My [device] isn't enabled on your device before it goes missing, there's no other Apple service that can find, track, or flag your device for you.

You can't locate it using the IMEI.