Hello, In my opinion, the MUST HAVE feature for a mobile app is to have off-line functionality. Possibility to add, modify, read records and links even without data or wifi connection. Then the apps automatically syncs as soon as wifi or data connection is available. For intensive travelers this is a must have for a useful app vs a nice gadget and it will give the chance to update the info as soon as they're fresh without waiting to have a connection available.
Offline use of mobile app