New iPhone 4 antenna problems?

So I got a new (direct from phone company) iPhone 4 less than a month ago and I've noticed some signal issues depending on how I hold it (covering the black strip on the bottom left side). I was just wondering if every iPhone 4 has this problem or if it should be solved in the newer handsets. And also, what can I do to solve the problem without putting a case/tape on the phone? Would apple exchange it?

I'm pretty sure the 4 needs a case to overcome the issue you are referring to. Can you return it? Ask whoever you bought it from.

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