**Key Points:** - Opera Mini has been operational for 20 years as of August 10. - Early versions, like the one launched in 2005, featured small-screen rendering techniques, which adapted web content for flip phones by breaking up layouts into vertical strips. - The introduction of version 4 in 2007 enabled a more sophisticated browsing experience by using server-side rendering with the Presto engine, allowing for zooming and panning of mobile-friendly webpages. - User comments reflect nostalgia for early mobile internet and the limitations companies faced at the time, such as compatibility among devices and the humorous misconceptions about technological trends. - There's a mention of QR code advancements that were being pitched in the early 2000s, showcasing the era's innovative spirit.