Problem regarding Wi-Fi network of my router

hi
I am having a bsnl wi-fi router I was first able to use the wi-fi on each and every device. But from few months I am able to use it on my laptop and my galaxy tab, galaxy fit. No other mobile leaving the two I have cannot connect to the wi-fi I tried many for my friends smartphones from the oldest to the latest but no use. But all the laptops get connected to the wi-fi. i tried changing the security option I even kept it open network but no use. Can anyone suggest whats the problem and any solution on this.
 
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