Location-based service is a service mechanism that generates geographical location information. This service will certainly give much benefit as there are many people who would like to find public facilities quickly and easily. The needs to know the existence of public facilities quickly and easily is of great demands in the society. Based on the above problems, it is necessary to develop an application that can get any access to the geographical location in mobile phones. Information from this application is expected to help searching for such public facilities. This Searching for interest point information was read using the Location API in Xcode IOS 4.2. The resulting information was displayed on the application of the iPhone. From the test results, the information of the position was influenced by the availability of the information service provider, carrier signal strength, and mobile phone capabilities.