WTB] This kind of adapter or headphones that have this jack. It's for old Sony Ericsson phones. : r/gtamarketplace
Gomadic Car and Wall Charger Essential Kit suitable for the Sony Ericsson k800i - Includes both AC Wall and DC Car Charging Options with TipExchange
Classic Straight USB Cable suitable for the Sony Ericsson k800i with Power Hot Sync and Charge Capabilities - Uses Gomadic TipExchange Technology - Walmart.com
10pcs/lot Headphone 3.5mm Jack Adapter For Most Sony Ericsson K750 K810 W580 W810 Free Shipping - AliExpress
Sony Ericsson K800 review @ Esato.com
Sony Ericsson K800 Refurbished-original Unlocked K800i 3g Gsm Tri-band 3.15mp Camera Fm Radio Java Cell Phone - Mobile Phones - AliExpress
vhbw USB data cable compatible for Sony Ericsson K550i, K610i, K630i, K660i, K750i, K770i, K800i, K810i, K850i, M600i, P1i, P990i, R300 phone : Amazon.se: Electronics
BLACK H70 Headphone Handsfree Adapter for Sony Ericsson K770 K800 K660 Z550 Z780 | eBay
Sony Ericsson Headset Handsfree K750i W810i K800i W850i | eBay
Redukce Fast Port/3,5 mm stereo Jack + mikrofon - Sony Ericsson | SUNNYSOFT
Sony Ericsson HPM-85 Headset Handy Phone Kopfhörer Audio Adapter Fast Popt 3,5mm | eBay