I have lost most of my contacts on the phone account, but they still exist in my telegram account. How can i move them to phone or export them?
It's very easy to transfer contacts from telegram account to your android smart phone: Just install a contact backup software from google store like "+contact backup" and after that make a back up from your contacts; it automatically collect all of your contacts from every account that you have on your phone: telegram,google,phone etc. after completing your back up you can import the created file to your phone or google account. it's finished
For WhatsApp, here's a trick that might work, but you need to use WhatsApp Web to do that:
Download your WhatsApp Contacts with the help of the bookmarklet here.
(The contacts get exported as a CSV list)
Now you can convert the CSV file to .vcf using some tools available..
Here's a tool that you can try: CSV to vCard