To collect data on a mobile phone, you must have a device that can load the necessary software tools and makes it easy for users to collect data. Below are specifications for what kind of device to buy or look for. Older devices can also support Ona or ODK collect data collection tools, but be sure to test compatibility. We recommend if you are going to purchase a device, to buy ones that has:
Android 5.0 or newer
8gb or more of internal storage
1gb or more ram
1.0GHz Quadcore processor or faster.
3G or 4G is good if the collection will be done by user with no access to wi-fi connection within a week or more.
Examples of such devices, for partners purchasing devices in France (no 3G / 4G) include: