Minecraft cant join multiplayer friend who plays in ps4 and im mobile ..

Hello so i just bought minecraft to play with my friend in his ps4 and iam on ios,

but the problem is when i connect to his world it says connecting for a long time then screen

pops out and says (unable to connect) can u please help i feel like i bought it for nothing and 

ive tried to so many thing and looked on the internet none of them work.