Some people have poor sense of direction, they can get lost easily even they have been to some places several times. To them, the iPhone built-in magnetic field sensor — a magnetometer — to give compass readings, is the handy tool that they need most. We need it to determine…

Google Voice is a free phone service released by Google, which provides call forwarding and voicemail services, voice and text messaging. It allows users to make and receive phone calls and messages across platforms and accounts. In the platform, Google will provide users with a phone number, which integrates all…

As we all know, Apple offers built-in Alarm for us which includes all the basic features we need for an alarm clock, but it lacks some interesting features analyzing your sleep quality. Some third-party alarm clock apps will include interesting features that the default alarm clock app on iPhone doesn’t…