Samsung’s Galaxy S4 might not have been a smash hit to the degree that many industry watchers were predicting, but it is still wildly popular. It’s also the fastest-selling Android smartphone of all time. Executive vice president of Samsung’s mobile business Lee Young Hee confirmed last week that the phone’s successor, the Galaxy S5, will launch in either March or April of this year, and now a new report claims to narrow that timeframe down significantly.