// (Do this up front somewhere else.)
var closeMethod = typeof(OpenNETCF.Phone.Sim.Sim).GetMethod("Close");

// (Do this many times.)
using (var disposer = new Disposer<OpenNETCF.Phone.Sim.Sim>(OpenNETCF.Phone.Sim.Sim(), closeMethod))
{
    // Use the 'disposer.Object' property ...
}