Having trouble connecting devices to internet, laptop works fine though. Any ideas?

For months I have used the same Wi-Fi connection to connect my laptop, iphone and PS3 to the internet. The past few days, my PS3 and iphone will not connect but my computer still works fine. I did not change any settings on anything and have already tried powering down and restarting both the modem and the router.

Added (1). I also just talked to my roommate and he said the exact same circumstances happened to him

Use the DHCP page on the router to reserve IP addresses for each device to avoid clashes

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