Here's a revolutionary illustration never before made called 'hand holding a phone' and also as a bonus I think there's a thumbs up in the mix
Buy Hands Holding Phone 7 by Uidea on GraphicRiver. Hands holding Phone 7 Showcase your work in style with these Phone 7 in Hands Mockups.
Hand Holding Phone Mockup by Grebenuk Hand Holding Phone Mockup. Which available in high resolution Easy change via Smart Object.