Mobile network plans that only offer cellular data, without the usual phone number and messaging services, started becoming more popular a few years ago. They're still not incredibly common, but they can be a cheaper method of adding LTE or 5G to a tablet or PC. AT&T is one carrier that has offered data-only plans for a while, and now the company is updating them with higher data caps and lower monthly bills.
AT&T's data-only 5G plan for tablets and laptops just got cheaper
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