Would a mobile broadband modem be better?
For frequent users, or users looking for a faster experience, tethering may not the best option because your connection may interfere with your ability to take and receive calls. In these cases, another option is to use a mobile broadband modem like the Pocket WiFi Extreme or USB Extreme.
The advantages are that it's a dedicated Wi-Fi or USB connection so you will get longer battery life and better performance. Plus, Pocket WiFi Extreme can connect multiple devices at the same time. There is a range of 12 month, month to month, and prepaid options to choose from.