The Happyfox mobile app allows you to search a ticket based on several filtering options. 

To start searching, go to 'Search Tickets' on top of the list view.

1. Search by keyword

To search by a 'keyword', just type the keyword on the search bar and click search. The search results will be a normal keyword search.

2. Search by Ticket ID or Contact

To search by a Contact or a Ticket ID, enter the ID or the contact info on the search field and you will get options below like how it is shown here:

Now you can select the relevant options to initiate the search.

3. Search by setting Filter options

You can also filter tickets which fall under a particular category and/or priority and/or status, with or without selecting an assignee, and with or without selecting a due date option. At any point, you can swipe left on the filter options you have selected to reset all. You can single tap on any filter options for the list below to give the choices for that filter. Also you can double tap on any selected filter to delete it. Anything entered on the search bar with a space is taken as a keyword along with the filter options. 

Below is an example of a search by filter options :