IReadOnlyList<string> networkAccIds = Windows.Networking.NetworkOperators.MobileBroadbandAccount.AvailableNetworkAccountIds;
string myNetworkAccountId = networkAccIds[0];
//var myNetworkAccountId = "{95499FEF-1579-4547-A0BE-FF271ADBBE76}";
MobileBroadbandAccount accout = MobileBroadbandAccount.CreateFromNetworkAccountId(myNetworkAccountId);
var info= accout.CurrentDeviceInformation;
var IMEI= info.MobileEquipmentId;
var IMSI = info.SubscriberId;