First step: Create a contact list to save the phone numbers of the people you want to connect with on Zalo through your phone.
Second step: Once you've successfully saved the phone numbers, open the Zalo app. In the messaging app, select the Contact feature -> Click on the icon of a person with a plus sign to access the Add Friends feature -> Click on Friends from phone contacts.
Third step: Next, select Check contacts -> Update contacts
Fourth step: Now go ahead and click on Add friend.
Fifth step: After that, you can proceed to chat with your new friend on Zalo.
Step 1: After that, a notification will appear with the message Unable to send. However, don't worry, continue to the Messages section and send any message to the user you want to connect with. The purpose of this is to create a new conversation.
Step 4: Return to the Contacts function on your phone and delete the phone number saved in step 1.
Next, in the Zalo app, go to the Update contacts feature -> Click on Update.
Step 5: Now, to connect with someone who has blocked you on Zalo from their phone number, on the main interface of this messaging app, select the conversation of that person you created in step 3 -> Click Add friend -> Send request.
Visit the link below for more details: https://Mytour.vn/cach-ket-ban-voi-nguoi-da-chan-ket-ban-tu-so-dien-thoai-tren-zalo-26145n.aspx. This article from Mytour.vn has guided you on how to connect with someone who has blocked you on Zalo from their phone number. Additionally, if you don't want others to send friend requests via phone number, you can refer to how to Block Zalo friend search by phone number for implementation. Wish you success in following these steps.