It is because of medical devices and the delay in accessing 4G replacements that they extended it from Feb 2020 to 2022. It took me nearly 6 months to get my cpap machine because of all the shipping/importation delays caused by COVID. The new one has 4G. Some people need these things set remotely, so just like your heart monitor.
As to ereaders and tablets, most models use wifi as well. It has to be pretty old tech that uses 3G only for those. Also, I had to upgrade to a smartphone because virtually all the flip phones use 3g. The tech at Microcenter said in some tech, they can swap out the 3g part for a 4g.
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