Unfortunately, it’s not possible to right click on an iPhone using a finger. On Re-mote screens, right clicking usually requires a mouse or other pointing device, which an iPhone does not have. However, there are some ways to perform equivalent actions to right clicking on an iPhone.
Using 3-D Touch: An iPhone with a compatible version of iOS that has 3-D Touch functionality can use this technology to provide a way of simulating a right click action. During the 3-D Touch press and hold, a menu will appear on the screen with different options and no matter what is clicked, it is the equivalent of right clicking. This menu can contain different sorts of actions like opening a pop up menu, jiggling all app icons to delete, as well as access hidden Data Detectors like phone numbers, links, and addresses.
Using a Long Press: Many apps on the iPhone support a long press touch gesture as a way of accessing a menu, similar to a right click. All that needs to be done is to press the desired item on the screen for an extended period of time and a pop-up menu will appear. This menu may contain options such as copy, paste, delete, move, and share.
Using Voice Control: iPhones with a compatible version of iOS can use Siri’s help to open certain options on the screen with a voice command, like a right click menu. To do this, simply call up Siri and say, "Open (name of the app) with (specific title or whatever is on the screen)". A right click menu will open with available options like copy, paste, delete, or share.
Other than these options, unfortunately, right clicking on an iPhone is not possible with a finger.