Modern combat (by gameloft) might be a smart phone copy of call of duty, but Call of Duty Strike Team looks like a copy of Modern Combat.

Modern combats graphics are better, gameplay is better, and the price is about equal. The biggest kicker comes into play when you realise one large feature that is intrinsic to call of duty is missing, multiplayer. Modern combat has (admittedly fun) multiplayer. 

Shooters still don't feel as comfortable to play on a smartphone or tablet as their consul and PC brothers but if you're on the market for a mobile shooter there are better uses of your money than this striped down call of duty.