Messenger remains the default chat companion for millions of Pakistanis who already use Facebook — no phone number needed, so you can message anyone with a Facebook profile from Karachi to Khyber. Voice and video calls hold up well on typical 4G, and features like HD photo sharing, large file transfers and disappearing messages make it genuinely useful for students and small businesses. Pros: free calls without sharing your number, HD photo sharing and 100MB file transfers, end-to-end encrypted secret chats. Cons: heavy on battery and storage, Meta AI prompts and ads can clutter the interface. Best for Facebook users in Pakistan who want calls, chats and groups in one app.