New phone higher cost?

I currently have the Moto e phone for $9.99 a month, which is great; however, it has no storage. I want to upgrade to the Motog4 play, but it says the cost per month is $15. Am I not allowed to keep my current cost with a new phone?

all New Phones have to have the New 3.0 Plans Our Most Affordable Plans at $15/month, with Unlimited Talk & Text | Republic Wireless

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