I'm working on a house built in 1931 and they used metal mesh lath & plaster, so WiFi sucks and there's no easy way to fish new cabling. Several of the rooms have surface-mounted phone jacks and when I toned the cables to the punch-down blocks, I saw 4 pair, so I decided to try one for internet. It worked, but before yesterday AM, I didn't know how well. Connected it to my laptop and did a speed test- came in at 49+MBs and he's paying for 50MBs. I couldn't see any cable markings, but I guess I got lucky. Maybe yours will work out as well.