Facebook owned WhatsApp’s Privacy Policy updates have made many people unhappy. People are just checking out what to use as an alternative and everyday my contact list count at Telegram and Signal is rising. So here is a short round up.

Data that each of the three messaging apps collects from their users:

WhatsApp
Device ID
User ID
Advertising Data
Purchase History
Coarse Location
Phone Number
Email Address
Contacts
Product Interaction
Crash Data
Performance Data
Other Diagnostic Data
Payment Info
Customer Support
Product Interaction
Other User Content

Telegram
Contact Info
Contacts
User ID

Signal
None. (The only personal data Signal stores is your phone number)

Signal looks the best probably but your contact list will be not as crowded as WhatsApp at the beginning. But it looks it will change in future.