Does iPhone Signal Strength Deteriorate Over Time?

My iPhone 4 recently crossed over the 1.5 year mark, and I've noticed that signal strength has a suddenly deteriorated recently.

I'm making calls at the exact same locations as before but they are in-and-out or dropped with increasing frequency while data connection is also worse.

Do all phones deteriorate like this close to the 2 year upgrade cycle?

No, this is not really possible. I also haven't heard issues like this before.

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