Hey, Alar from the iOS team here. Unfortunately not via search. If you want to achieve that, then the only way I can see that happening is by creating custom fields for each city. For example, if you want to list contacts whose address field "Home Address" includes "Tallinn" then you can create a custom filter with the predicate "Person -> Home Address -> contains -> 'Tallinn'" and then use this custom filter in the mobile apps. Then if you add contacts where "Tallinn" is included in the address, if everything is synced up for the mobile app, new contacts will appear under that filter.