0035でんわ is a free mobile application developed by NTT Communications Corporation for Android devices. It allows you to make calls using your existing phone number at a more affordable rate by using a simple dialing operation or through a dedicated smartphone app. The call quality remains the same, and you can make calls regardless of your mobile carrier.

One of the best features of 0035でんわ is that it enables you to make calls using your existing phone number without changing it. The call quality is also unaffected, and the app provides an affordable alternative for making calls. The app features a dial pad, call history, contact list, frequently used items, and group settings for contacts. You can add "" to the head of your number automatically when making calls, and the app also supports filtering of the contact display account.