NFC Smart Q is another app that lets you write tags that trigger tasks and change your phone's settings for Bluetooth, Wi-Fi, Sound, Alarm and display brightness. You can also launch URLs, send texts, create electronic business cards or open photos, music or documents. On top of all these feature, the nice thing about Smart Q is the ability to lock your tags so no one else can overwrite them. You can also copy a tag to other NFC-capable devices and with the Switch function, use just one tag to toggle between two different modes. Instead of using two stickers for your bedside table, you can tap the tag to switch between sleep and wake modes.