Alternative to Telephony.Sms.getDefaultSmsPackage() in android SDK?

I want to check whether my app is the default SMS app in device or not ? In the Android Developer Blog they are using Telephony.Sms.getDefaultSmsPackage(),Where Telephony is a part of android.provider.Telephony which is a part of open source release . Here clearly mentioned that "you should not try to use it from your applications." than how can I find default SMS app in device ?