Samsung today announced that it has shipped more than 10 million units of the Galaxy S 4 less than one month after its global release on April 27. Co-CEO Shin Jong-kyun last week said that Samsung would hit the 10 million mark, and the company confirmed that it reached the milestone today. Samsung's channel sales, or sales to retailers like carriers and online stores, have made the Galaxy S 4 the company's fastest selling smartphone. The phone's predecessor, the Galaxy S III, took 50 days to reach the 10 million mark last year.

Sprint today announced that it has purchased Handmark and its subsidiary OneLouder, the company that manages Twitter client Tweetcaster and Reddit app BaconReader. Sprint purchased the companies as a way to improve its advertising and publishing business. Both Handmark and OneLouder will continue to operate under their existing brands and retain its staff, so the company will keep building and maintaining its mobile apps for Android and Apple iOS.

Many expressed disappointment yesterday when Google announced a new messaging client supporting instant messaging and video calling but not SMS. That feature will arrive in a future update according to Google+ Community Manager Dori Storbeck. When asked if Hangouts would support SMS integration, Storbeck confirmed that it will introduce "the most requested feature" later. There's no timetable for the unveiling, but Hangouts will eventually become the unified messaging client that Android and iOS users hoped to see completed in time for Google I/O.

Android has been criticized for not having enough tablet-specific apps, something never said about its top competitor in Apple's iOS and iPads. In a series of upgrades to the Google Play web store, Google will add new highlights for tablet apps. There are already recommended sections for tablets, but Google Play executive Chris Yerga announced today that the Play store will soon make adjustments to highlight more apps built for tablets or have screens properly designed to scale to larger devices. The updates will roll out in coming weeks.

Pinterest has updated its apps for Android and iOS to add a handful of new features previously unavailable on mobile devices. Mobile users can now receive push notifications when someone comments on a pin or mentions them. Pinterest also added the ability to mention someone with the "@" sign and an auto-fill tool, and an enhanced search menu that shows history and auto-suggestions.

Download Pinterest for Android or iOS

And Verizon makes four. The Samsung Galaxy S 4 has debuted for AT&T, Sprint, and T-Mobile, and the Android 4.2 device will finally make its way to Verizon Wireless beginning May 23. Samsung had originally anticipated shipping the phone May 30, but the company confirmed today that Verizon will sell the Galaxy S 4 for $199.99 on a two-year agreement beginning next week. Be sure to read our Galaxy S 4 review to learn more about the phone and read our Galaxy S 4 page for continued coverage of the device.

Android and iOS to-do app Astrid will cease operation following Yahoo's purchase of the company. Later this summer, Astrid users will no longer be able to add and save their task list across the web and mobile devices, but their data won't necessarily be lost. Any.DO - an alternative to-do list app that also supports apps for Android, iOS, Chrome - today announced an import tool that allows Astrid users to transfer data to Any.DO. Astrid users can download Any.DO and click the import button to initiate the transfer and have tasks, notes, and more transferred.

Download Any.DO for iPhone / Android

Google has instituted a new change that will unify storage limits faced by users of Gmail, Google Drive, and Google+ Photos. Until today, users have had 10 GB maximum storage for Gmail and 5 GB of combined storage for Drive and G+ photos. Those two allotments will be merged into one 15 GB cap that will enable more flexibility in storage options. Someone who uses only 7 GB of Gmail can now apply the previously unused 3 GB to increase data on Drive and Google+, or the inverse can be true. With Google+ providing the option to store entire photo collections, this should be welcome news to many Google users.

T-Mobile has announced when its retail stores and website will begin selling the Nokia Lumia 521. The previously announced Windows Phone 8-powered Lumia 521 will be sold at Microsoft stores for $149 and Walmart for $129.88 beginning May 11. It will not hit T-Mobile's official channels until May 22 when the phone goes on sale for $29.99 down and $5 for 24 months when purchased on an installment plan. The Lumia 521 features a 4-inch display, a 1 GHz dual-core processor, and 5-megapixel camera.

The Huawei Ascend W1 first appeared at CES in January, but the Windows Phone 8 smartphone has largely gone unnoticed in the United States. Huawei today announced that the phone will debut at Walmart later this month as the Huawei W1. With a 4-inch LCD screen, a 1.2 GHz dual-core processor, a 5 megapixel camera, and 512MB of RAM, the W1 meets the standard of Windows Phones released in 2012. The phone also has a 1,950 mAh battery with built-in technology designed to extend battery life. Details about price and exact dates have yet to be shared, Huawei will have more information soon. Read our previous Huawei W1 coverage for more information.