It offers good AT&T cellular connection but you MUST use the right rasp. Pi Utilities and Modem Scripts - Update Rasp. Pi (apt-get update), install qmi-utils and udhcpc and install the modem startup/management scripts (modemcomms-scripts-rawip.tar) from the waveshare wiki. The files are located in SIM7600X-4G-HAT-Demo.7z. Anyway, I would say that this product needs more complete documentation for a newbie to install it on rasp. Pi.
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