The Huawei GSM router Gateway B683 with SIM card Slot is arguably the best 3G WiFi router with telephony on the market. with an embedded 3G chip. It has 4 ethernet ports, an analog port for attaching a phone, WiFi support, a USB port for connecting external devices as well as a connection for an external antenna. It supports 850MHz 1900MHz and 1700MHz AWS (band 4) Mhz 3G bands and is ideal for any SIM cards that use the all American UMTS network.