Boost Mobile Shenagians

I just replaced my original iPhone SE with an iPhone 2020 SE. I try to port my SIM card over and can't. After gettign in touch with Boost they tell me I need to be on their "enhanced" network and can't stay on my current plan.

Current Plan: 35GB/mo Unlimited TTD $40

"Enhanced" Plan: 15GB/mo Unlimited TTD $50

So, an extra 10 dollars for -20Gb!

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So I'm currently with a new orphan phone while I figure this out. Just a heads up for anyone who got ported over from Virgin.

It's been a while since I've done this. Does the ATT $300 prepaid support the new iPhone SE? Last time I did this GSM/CDMA compatibility was a thing.

Update: Been on for 3 hours now with 3 different people. No luck.