My iPhone suddenly has weak Wi-Fi signal strength?

This has been going on for about a week now and it happened suddenly.
My 3GS suddenly has terrible Wi-Fi signal strength, meaning that if I'm in my room now, I can't get Wi-Fi while sitting on my bed. I have to be on the same floor basically as my router.
Is there something I can do? Is there dust blocking something? Tips please?

IPhones have notoriously weak antennas. That's probably the case

Just get a new phone… Lol, I'm an iOS Technical Advisor with Apple so trust me when I say that trying to make a 3gs function better is just going to end up being a waste of your time. I'm sure your carrier will tell you that you are eligible for an upgrade if you ask them

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