I recieved my iPhone 6 Plus but no SIM card that was supposed to come with it. Is the SIM card already installed in the phone?
I had an iPhone 6 and an iPhone 6P delivered, and the SIM cards were already installed in both. You can remove the SIM cover and confirm or just try to activate. Also if you turn the phone on, if there is no SIM it will say NO SIM in the upper left where the signal level usually is. If it says anything else, then there is a SIM installed.
I believe it is.