This model works on 3G networks as advertised. Set up was easy and with the antenna mounted outside it gives the best results for boosting the signal. We can get 5 bars (-85 dbm) within 10 feet of the inside booster antenna and this is great for phone conversations. If you are anywhere from 10 - 20 feet, the signal drops to 2-3 bars (-97 to -100 dbm), which is fine for sms/mms.
We live in the country and our cellular signal is normally 1-2 bars (-105 dbm) and I was initially skeptical of the claims this product made. However, I'm impressed with the results. I would recommend this product.
Note: If you want a 4G/LTE booster, you will need a higher end model, which of course will cost more $$$.