Mobile phone ownership in Bangladesh is widespread, with 73 million subscriptions for a population of 142 million. Most people have basic feature phones rather than smartphones. Six focus groups discussed mobile phone use among adolescents in urban and rural Bangladesh. General patterns included playing games, wanting sexual and reproductive health information via phone, and difficulties of gender roles. Suggested mobile tools included an application to facilitate the work of peer educators, a tool to advocate for girls' freedom, and providing puberty information to boys.