Bolt is a free replacement for Android’s default phone app that lets you talk for free with other Bolt users, automatically discovers who you talk to most, and streamlines your calling experience.? Calls to other Bolt users are free.? Just make sure to dial their "Bolt" number when it appears in their contact details.? Calls to normal phone numbers use your minute plan without leaving the app.? Favorites are automatically discovered and updated based on who you contact most.

提升体验，修复部分问题。