Venn Mobile Unlimited Minutes, Texts, and 4G LTE Data + 50GB Hotspot for $21/Mo. (First 6 Months) Then $30/Mo (No Contract)

Venn Mobile is offering $9/off per month for the first six months after code " SAVE9".
They only have one plan, which is unlimited minutes, texts, 4G LTE data, plus a 50GB hot spot. The base price is $30/mo. with no contract. After coupon, the price for the first six months is $21/mo.
*** Note- you cannot port in an existing Sprint number.
The only other fees are a $3.50/mo. regulatory fee (for comparison, Mint charges roughly this, and Visible rolls it into their plan), and a one time $10 fee for a new SIM (these are free with Mint and Visible, I think).
They also sell phones starting at $30 with a plan. A "like new" iPhone 6S is $70, Samsung Galaxy J3 is $30.
https://vennmobile.com/