OpenCall
Application · Phone & contacts / Android · 2026
A complete phone app: T9 dialler, in-call screen, conference calls, contacts and number blocking.
An open-source calls and contacts app for Android that replaces the system dialler: from T9 dialling through the in-call screen and conference calls to a contact editor and vCard backup.
The dialler suggests contacts from the digits – including initials and regardless of diacritics – and holding a digit triggers speed dial. The in-call screen handles a second call, conference calls with a participant list, reject-with-SMS and screen-off near the ear.
History groups consecutive calls with the same number, has filters and a CSV export that opens in Excel without an import wizard. Contacts come with a full editor, per-contact ringtones, duplicate detection and merging, and vCard import and export that skips contacts already on the phone.
Features
- T9 search that handles diacritics
- conference calls and call waiting
- contact editor and duplicate merging
- history export to CSV and contacts to vCard
- requires Android 10 or newer
Technology
- Kotlin
- Jetpack Compose
- InCallService
- ContactsContract
My role
Design, architecture, implementation and releases