OneCall is a business and productivity app available for iPhone users. Developed by 大林 陈, this app offers users a real phone number for making local and international calls at a much cheaper rate than what carriers provide. In addition to calls, users can also send text messages, images, and videos using OneCall. The app ensures privacy by allowing users to use a second number for calling and texting, keeping their real number safe.

OneCall is not only useful for personal use but also for business purposes such as dating and e-commerce. The app provides high sound quality for overseas calls, ensuring a smooth communication experience. With OneCall, users can separate their business and personal life effectively. The app is free to download, does not contain any ads, and is safe to use.

It is worth noting that OneCall also offers auto-renewable subscription options for users who require additional features. The subscription prices range from $3.99 per week to $59.99 per year, depending on the chosen plan. Users can manage their subscriptions and turn off auto-renewal through their Account Settings. For more information, users can refer to the app's privacy policy and terms of service available on the developer's website.