GGPoker Mobile
International grinders wanting desktop-level features on mobile

GGPoker's mobile client is the closest thing to a desktop replacement in online poker right now. The app runs the full game suite: cash games, tournaments, Rush & Cash (fast-fold), Spin & Gold, and All-In or Fold. Every format from the desktop client is playable on the phone.
Multi-tabling up to four tables works reliably on phones released in the last three years. The tile view is plain, but it gets the job done. Swipe-to-fold is responsive enough for Rush & Cash sessions, and the bet slider is better calibrated than most competitors.
The Smart HUD (GGPoker's built-in tracking overlay) is the single biggest differentiator on mobile. No other major room gives you HUD data on a phone. You get VPIP, PFR, and basic tendencies on every opponent at your table. For players who rely on reads, this partially closes the gap between mobile and desktop play.
Battery drain is moderate. Expect roughly 30% drain over a two-hour session on a modern phone. The app does not overheat most devices, which is more than can be said for some competitors.
Where GGPoker falls short on mobile: table selection. On desktop, you can scan dozens of tables and filter by average pot size, players per flop, and wait lists. On mobile, the lobby is simplified. If you are a table-selector, you will miss the desktop client.
The player pool is the largest available outside of regulated US markets. Peak hours (European evenings) consistently show 10,000+ cash game players. That liquidity means you can find action at most stakes on mobile without waiting.