The AirCard 753S is a new mobile hotspot device to come from Sierra Wireless. The device is exactly the same as the 754s except it doesn't support 4G LTE networks, only 3G networks.

The 753s supports Dual Carrier HSPA+ network which gives it a theoretical maximum download speed of 42Mbps and upload speed of 5.76Mbps.

 As with other mobile hotspots the 753s will support up to 5 WiFi enabled devices.

Currently the 753s can be purchased from the following mobile network operators:

Australia: Telstra - Ultimate Mobile Wi-Fi
Australia: BigPond - Ultimate Mobile Wi-Fi

Devices purchased from network operators will be locked. The unlocking solution can be purchased from 753s Mobile Hotspot Unlock. Once unlocked the device will work with SIM cards from any network operator.

The Huawei E587 is a high end wireless modem (aka MiFi, Mobile Hotspot, Mobile WiFi) supporting Dual Carrier HSPA+ making it one of the fastest 3G devices available.

The E587 is not a true 4G device as many websites are suggesting (probably for marketing reasons). It uses the latest 3G technologies to get high download speeds of up to 42Mbps. As always, in the real world this speed is not achievable and expect top downloads speeds to be more in the region of 16Mbps. Networks that don’t support DC-HSPA+ will see the max download speed considerably lower. None the less, the reported real world speeds we’re hearing about are very impressive.

Note: Sadly no UK networks currently support DC-HSPA (up to 42Mbps) so only expect HSPA+ speeds (up to 21Mbps).

As with just about all wireless modems the E587 can support up to 5 Wi-Fi devices connected simultaneously. Considering how mobile broadband speeds have gone up dramatically compared to the first wireless modems (e.g. Huawei E5830) it would make sense to enable more Wi-Fi connections.

The Huawei E587 can be bought independently and is available from the following network operators:
-    T-Mobile (USA) - called the Sonic 4G Mobile Hotspot
-    Telus (Canada) – called the E587
-    Three (unconfirmed reports)