mobile.chooseContact
Lets the user choose a contact from the mobile device contact list and returns the vCard.
Syntax
ui.Interface.frontCall("mobile", "chooseContact",
   [], [result])
- result - The vCard string from the device's contacts database.
 
Usage
The "chooseContact" front call opens the mobile device contact
 chooser, allows the user to select a contact and returns the contact as a vCard string.
Important: 
For GMA / Androidâ„¢,
using the chooseContact front call needs the android.permission.READ_CONTACTS
Dangerous Permission to be specified when building the APK. See
 Android permissions for more
details. On Android 5.1 and lower
(< API 23), use the android.permission.GET_ACCOUNTS permission.
If the user cancels the contact chooser, NULL is returned.
Example
DEFINE vcard STRING
CALL ui.Interface.frontCall("mobile", "chooseContact", [], [vcard] )