This LTE modem antenna works very well. Where I live, which is in the country, the signal strength is excellent. I've seen upload speeds from 15 to 40 and uploads from 8 to 20. If you are having problems with the SIM card and this device, I would recommend contacting your ISP, which I had to do because I didn't get any service to begin with. All in all I would recommend this device to anyone who needs a good internet option or is just tired of their current ISP (which I was), at least I would advise trying this antenna modem.
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