Framesira/Shutterstock We may receive a commission on purchases made from links. Many people today know Oppo as one of the best smartphone camera makers, but it wasn't always like this. Founded in 2004 in China, Oppo started its journey by making digital MP3 players that ditched the old boring design for a cooler aesthetic. The formula was a hit, and in 2008, the company launched its first phone, nicknamed the "Smiley Face." Since then, Oppo has continued to innovate, with its version of fast charging introduced in 2014, before it also launched Europe's first commercially available 5G smartphone. Oppo currently ranks as…