On iPhone, you can add pins (markers) by long pressing a new location in the map that comes with the app. Then select a location and press and hold to place two or more pins (markers).
1. Unlock the iPhone to the home page, find and open the built-in application map. As shown in the picture.
2. After entering the map application, the blue circle represents your location, click the blue circle. As shown in the picture.
3. Click the blue circle and the My Location menu will pop up. Select Mark My Location in the lower left corner. As shown in the picture.
4. After selecting Mark My Location, a pin (marker) will appear. As shown in the picture.
5. Select another area where you want to place a pin (marker) and long press this area. As shown in the picture.
6. Long pressing this area will place a second pin (marker) on the map. As shown in the picture.
7. Select the third area and press and hold to add a third pin (marker). You can place two or more pins on Apple's own map. As shown in the picture.