The Galaxy S4 the Android smartphone by which all others will be judged in 2013. As Samsung announced on Wednesday morning, Judgement Day is coming this month on every major wireless carrier in the United States. The world’s top smartphone maker has confirmed that its new flagship smartphone will launch on seven different carriers in April, including AT&T, Sprint, T-Mobile and Verizon Wireless, U.S. Cellular, Cricket and C Spire. The Galaxy S4 will also be available at a number of the nation’s leading electronics retailers beginning this month, including Best Buy, Best Buy Mobile, Costco, RadioShack, Sam’s Club, Staples, Target and Walmart. Specific pricing and launch dates will be announced by individual carriers in the coming weeks.