Go to > Security (or Applications on some older models). Find the option for Unknown Sources and toggle it On . 3. Download the APK
No. Voice calls were introduced in Telegram version 5.0, which requires Android 5.0. The legacy APK for 4.2.2 stops at version 4.9.1 functionally. telegram apk for android 4.2.2
Using the correct Telegram APK for Android 4.2.2 allows you to: Go to > Security (or Applications on some older models)