Hi
This is a hard one to say as you would need a phone with the same WiFi chipset or the same phone to see if it’s a issue
5Ghz networks are shorter range but have better capabilities
The reason why other devices are picking it up and your one isn’t may be due to it having a different WiFi chipset
Different chipsets are good at doing different things so some might pick signals up better than others
If you are unsure about compatibility I would ask the manufacturer
Hopefully this helps
Any questions please ask
Thanks:-)