Droids with a pre paid plan?

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http://androidforums.com – I have a prepaid plan with Verizon ($20 a month for unlimited texting and I pay for whatever minutes I use, since I usually use less than 25 minutes a month), but I've been using my old enV2 since I switched to this plan. I was thinking of changing over to the $50 a month unlimited thing, but it depends on which phone I get. I have 2 phones availale to me (both Droids, one's an Eris, and I think the other is an a855). Can I used either phone on the plan I have or the $50 one? (General)