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1. The Runtime SDK or iOS doesn't work with ArcGIS Server Mobile services. Instead, it works with REST based ArcGIS Server services (Map, Geocode, Geoprocessing, etc). These services can be on ArcGIS Server version 10.0 or above.
Here are the system requirements for the latest version (10.2) of the SDK :
https://developers.arcgis.com/ios/info/system-reqs.htm
Note, you can use this SDK even with older versions of server going back to v10.0