How do I get my Verizon cell phone to work with my activated US Cellular sim card?

I have an iPhone 5s that has a US Cellular SIM card that's activated. I took the card out of my iPhone and inserted it into my Verizon Droid 4 that is Unlocked. The Droid 4 connects to the network because I have 5 bars and a 3G icon in the status bar. The problem is, I can't call or text. It won't connect to the person I'm calling. Can someone please explain to me how to fix this?

All your Droid is telling you is it has a signal, it isn't necessarily connected to the network on a communications level. According to the carrier's website, that device isn't compatible with their 4g network. If you're getting a 3G signal it may be something in the device's APN settings that needs to be reconfigured, it's probably still looking for a Verizon APN.

The SIM card us locked to the iPhone and can't be used with any other phone.

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