my computer speakers make a weird noise when i send or get a text. . . why?

Usually in the day, when I’m on the computer, and my cell phone rings, my speakers make some weird noises. But the weird thing is that when im sleeping at night with my cell phone and speakers off, it still makes the noise! what is this?

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Whenever I have my AT&T phone near my computer and I’m about to recieve a call or a text, it makes my speakers (from the computer) emit these weird feedback noises. It also does it if I’m on the phone near the computer. My old Verizon phone didn’t do this. I’m sure it’s not harming anything but is it just radio interference or something weird like that? Anyone else had this happen? Thanks!

My phone is a Motorola V551. Everytime make/receive a call or when I receive an SMS, there is some interference between my cell phone and my computer speakers. What is causing that and how can I prevent it aside from staying away from the computer when i’m on the phone?

There’s a place to plug normal headphones into my phone, so could I put computer speakers there instead? Like, the ones that you can use with any computer. .
Also, where could I get computer speakers? I don’t want to mess with the ones connected to my computer.