Verizon Messages compatible with other prepaid carriers?

I have a second like that is a prepaid plan from a different carrier, but I have read that Verizon Messages can be used even by non-verizon customers. I would like to be able to use Verizon messages with this second line, but the device I have is not a smart phone, so I cannot download the Message+ App... it is a boring basic flip phone (which is why I would like to be able to use Verizon Messages), but it does have Internet and 4G/LTE capabilities. I have tried to download the Message+ App on my iPod, iPad, and dell laptop but have no luck in receiving the security code when I enter my phone number. Is there a different way for non-verizon customers to subscribe to Verizon Messaging, or does having a basic phone make it impossible?

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