I’ve recently suggested a wifi extended/repeater to a friend of mine as his wifi signals stuggles to reach his room. I’ve read about wifi repeaters and suggested one to my Friend. He bought one hearing my suggestion and fu*ked up.
The repeater caused huge jitter and latency and made the internet unusable. Luckily he doesn’t remember who suggested it🤷♂️
A friend of mine had the problem that her rather old tablet did not support a GSM stick, so I recommended her to buy a newer one. Which did not support any kind of GSM stick, either.