Originally Posted by Orkun KnighTR34

Smartphone has many functions than bike computer but I don't recomend using main smartphone as bike computer because of charge issue. I think use old smartphones as bike computers are best. Smartphones aren't just a bike computer. They are very functional device. You can use GPS for find routes. You can listen music from them during riding by earphones or speaker. You can upload your music you want listen during rides to old phone and can save memory of main phone.