There are two kinds of WiFi access points, ad-hoc and infrastructure. Joikuspot on Nokia Symbian creates an ad-hoc WiFi zone. Many devices do not work detect ad-hoc wifi zones, they need the wifi in infrastructure mode. This is the reason why some tablets and laptops fail to detect joikuspot hotspot.
It is a limitation of Symbian and it is not possible to create an infrastructure mode wifi hotspot in Symbian OS. Some devices that can not detect ad-hoc wifi zones are kindle, android devices, windows 8 computers. Android devices can be made to access ad-hoc zones but this needs rooting. Computers upto Windows 7 work with ad-hoc connections, but windows 8 does not recognize ad-hoc networks.