https://www.bellingcat.com/resources/how-tos/2019/04/08/using-phone-contact-book-apps-for-digital-research/
# GetContact# Free, need SMS requirement (burner) + email# Banned in some countries but works good# List one possible name# TrueCaller# Free, need Google or Microsoft account# Works good, list one possible name and tags# CallApp# Free, need Google or Microsoft account OR SMS# Works good, lists comments from users about number, gives a# reliability score to number, shows how often the number was searched# Dalily# No requirements, free# Focused only on Arabic-speaking countries# Can search by either name or number, and also will provide all contact book# information (email, etc), not just name and number# Eyecon# Free, SMS requirement# Photograph and one name for the contact# Viewcaller / Showcaller# No requirements, free# Only one name, very basic details
Getting informations using a phone number
# When you have a phone number, you can use some messaging websites/applications# If the target is registered, it can provides additional informations# /!\ Some applications might tell the target you've reached them /!\
https://medium.com/@Ginger_T/how-can-we-use-messenger-apps-in-osint-682cbc634f
Facebook Messenger
# Profile picture and details from Facebook bio
Facetime
# If you add a contact on Apple it wil tell you if the target can use Facetime# If so, you know the target is using an Apple Product
ICQ
# Profile Picture, Nickname, Name, BIO & last seen.# Will show when someone is on-line.
Skype
# Display, username, profile picture.# It will provide the name as per the server not your contacts# Also location information of where they say they are from along with a date of birth.
Telegram
# User's profile photo, username and bio# From the desktop app, you can see previous photos
Strava
# Profile picture and the name on Strava server not in your contacts.# Will also show the location they are from if this field has been completed and Bio info.