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How To: Secretly Call & Message Contacts Using an Innocent-Looking Android Calculator

How To: Carrier Unlock Your Samsung Galaxy S4 So You Can Use Another SIM Card

How To: This Innocent Calculator Is Really a Secret App Safe for Android

How To: Auto-Reply to Missed Calls & Texts on Android When You’re Busy

How To: Receive Urgent Calls & Texts When Your Android Is in Silent Mode

How To: Add No-Bulk Wireless Charging to Your Samsung Galaxy S4 for Under 30 Bucks

Why do we still need to plug in our phones to charge them? Wireless charging exists, and has for quite some time, but most manufacturers don't include it in their devices. When it comes to the Samsung Galaxy S4, you can buy a QI-compatible wireless charging kit, but between the charging pad and the battery cover, you're looking at around $90 or more.