I can't connect some devices with my home Wi-Fi?

From 2 weeks my wife works fine, but now i can't connect some devices to my home wife network but when i try to connect these devices to another wife router it works fine

these devices that can't connect to wife: iPhone, blackberry, xperia tibo & Nokia device, but my laptop & my PC internet cable works fine

please help me & sorry for my English

Thanks.

Added (1). EX: when i try to connect with my iPhone it says "unable to join the network"

Please explain "can't connect to Wi-Fi" further. What error message are you seeing? Does it say connected but you can't access the internet?

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