Use APKPure App
Get Export Contacts CSV for Gmail old version APK for Android
Xuất khẩu địa chỉ liên lạc của bạn vào một tập tin CSV Gmail thân thiện.
Do you have contacts in your address book that are not syncronized with Google and you want to? Such as those on your SIM card, phone memory or any social network...
Quickest way to do so is to export those contacts to a CSV file and then import them to Google contacts through Gmail web interface.