Selfie cameras have been a thing on smartphones since the days of the iPhone 4 in 2010. But 14 years on, their quality still varies hugely. Most of the best camera phones have strong front-facing cameras, yet many budget handsets and mid-range phones still struggle. Ultimately, the selfie lens is always inferior to the main rear one, which can be very frustrating. However, one kind of phone emphatically solves that issue by using the rear cameras to take selfies. You guessed it: flip phones. The modern foldable design allows you to fold the device in half, bringing the main lenses to the front…