*
* @param numbers The set of phone number in question
* @return A map of numbers to booleans. True if registered, false otherwise. Should never be null
- * @throws IOException if its unable to check if the users are registered
+ * @throws IOException if its unable to get the contacts to check if they're registered
*/
public Map<String, Boolean> areUsersRegistered(Set<String> numbers) throws IOException {
// Note "contactDetails" has no optionals. It only gives us info on users who are registered