https://www.theverge.com/2018/6/15/17467816/apple-iphone-3gs-south-korea-sk-telink

The Apple iPhone 3GS is going back on sale via South Korean carrier SK Telink after a new batch was found still in boxes at a warehouse, as reported by VentureBeat. The devices will be sold with original packaging for 44,000 won (about $41) with no contract. When the phone first came out in 2009, the 8GB model retailed for $99.

Since the phones have been sitting unused for almost a decade, SK Telink will be testing each one to see if the battery has held up, then it will repackage them for shipment. Even if the battery works, the data speed will be slower, and the phone won’t be able to run many current iOS apps, and it also uses an older, larger SIM card. Also, if it breaks, repairs will probably be hard to come by. However, it should be just fine for basics like making and receiving calls and sending texts... and it has a headphone jack.