You are correct there is no Check All or Uncheck All in Contacts. If I understand your question correctlu, the Contacts app on the Mac is more oriented to sending emails, while on the iPhone it is oriented to telephone calls. You might send an email to a Contacts group but you would only call them one at a time. There are a number of Contacts apps in the iOS App Store, you might check them out to see if one of them fits your needs better.
