As I understand it, you need to be on one of the more recent Red plans, which include 5G. You don't need an Unlimited plan and I believe that capped plans will run at the fastest speed available. Obviously, given its speed, 5G will eat up you data in a very short time if you use it to its full capability. I don't think you can get 5G added to a non-inclusive plan.
If your plan is older, it won't include 5G and you can check this by looking at the details on My Vodafone (online or in the app).
When 4G arrived, it was only added to plans when it became available in the area in which you lived (unless you opted for a 4G plan). 5G will eventually become mainstream, but that'll be a while yet, while it rolls out.
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