Great question, magenta6886355!
There are a couple different factors that come into play. Is your account on AutoPay? Do you already have a Data Only line set-up? How much data are you wanting a month? Lastly, are you looking to finance the device or pay it all upfront? If you login to your My T-Mobile account, you should have the option to add a line and select the Alcatel Hotspot to get the accurate pricing.
Amanda asked some really good questions. Please let us know if you still need help with getting the hotspot set up on your account.