If it's the new AT&T prepaid sim that has the 5G branding on it then there is no issue when switching devices. With 3G/4G non LTE gone, AT&T and Verizon are now by default handing out new 5G enabled sims either by shipment or if you visit a local store and request a new Sim card.
When it comes time to switch to a 5G device just insert the Sim card and it will download provisioning, then once done make sure to call customer service and tell them to update the imei of the new tablet so the system knows exactly which Tablet your using.
Home Entertainment: Xfinity 800 meg per second plan, Roku Ultra for Streaming.
Landline: N/A
Mobile Entertainment: Verizon Unlimited Plus Prepaid for main, Visible+ as my secondary plan.
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