T-Mobile offers the 3.88-oz T-Mobile Sonic 4G Prepaid Mobile HotSpot for $69.99 with free shipping and free activation. (To find it, search for "Sonic" and choose the one marked "$69.99.") That's the lowest total no-contract price we could find for this device by $115, not including the $25 data card. Sales tax is added where applicable. This mobile hotspot allows for simultaneous Internet access for up to five WiFi devices and comes with a charger, carrying pouch, and more. It features a microSD card slot and USB connectivity.