It should be a reply to OPs question in the comments but I don’t have 50 reputation yet. If moderators can merge it somehow, please, feel free.
Abonament is a long-term contract.
Karta is pay-as-you-go. It is pre-paid and you charge it by buying and redeeming codes (e.g. in convenience stores and newsstands).
Mix is, well, a mix of two. You pay as you go, but sign a contract on how long you will go.
In your situation go for “karta”.
Here you have links to polish mobile operators:
As far as I know all of them have offers of 4G mobile Internet (LTE).
Credit:stackoverflow.com‘
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