How to Find Old Phone Numbers?
Recover phone number that you deleted off your iPhone Select your iPhone backup. Choose "Recently Used Contacts" in the middle column. Scroll through the list of contacts to see if the deleted phone number is recoverable in your iPhone backup.
Scroll down to the Contacts section and open Contacts by tapping on the entry or clicking the Open button. You can also just go directly to Google Contacts. You will now see a list of all contacts saved to your Google account. Open the side menu and select Trash to recover any numbers you've recently deleted.
How to Search for Someone's New Number Using the Old One
How to find the serial number on any iPhone
You can find the serial number of your device inside the Settings app. Just go to General, then About, and the serial number will be at the bottom of the first block.
You find your serial number under Settings > General > About. The Apple URL only shows whether the phone is still under warranty. It does NOT disclose the age or purchase date of the phone. Tonefox's reply, however, DOES provide an URL which discloses manufacture date, factory location, and other phone parameters.
From the lock screen, swipe up from the middle to see your notifications. If your iPhone is already unlocked, you can swipe down from the top to see your old notifications.
If you deleted a contact's number after originally blocking it and now you want to get the number back, you may be able to do so.
To find old iMessages:
all you have to do is select the podcast in your itunes hit podcast settings, select keep and download "all episodes" and then you will see all the old ones too.
Phone look-up services can tell you an iPhone's general whereabouts, but these services are limited, unable to track in real-time or reveal a precise location.
How to find the IMEI number on your iPhone using the Phone app
Step 1. While your phone is ringing, don't pick it up. Step 3. Dial *#30# the hidden number will be revealed on the screen.