Contact Collector Ad
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Since it is basic contact information, the screen is simple. A mandatory name and optional email and mobile number. Tap Add and that's it. That is the very basic information required. This also make the whole process quick. Once event ended, tap Menu -> Export to export all those users information to a csv file. You can then do some fine-tuning further like invalid email address etc.
The application support English, Simplified Chinese, Traditional Chinese display.