Open the Google Maps app on your iPhone
Search for a place or drop a pin on the map
Tap the place name or address at the bottom
Scroll down and tap Street View or the photo with the Street View icon
If available, tap the Street View preview to open it
Drag your finger to look around
Swipe on the screen to move through the street
Pinch to zoom in or out
Tap the back arrow to return to the map