I am a T-Mobile customer. I am relatively happy with the service, but the coverage is garbage. I thought I would try something else, and Freedompop offered me a SIM for $0.99, and then another sim for $0.01. Then they informed me that my trial began as soon as they shipped the SIM cards. Before I've even had a chance to do any testing, they sent me a reminder that I had only 3 days left of my free trial before they would start charging me money.
I tried to become a freedompop customer once before. They had a deal for a free phone, and they listed models which were supposedly in stock. But once I got through to a representative, they told me that they didn't have my chosen phone (literally the only one in their selection I was interested in) in stock, so I aborted the signup process. When I got the new SIM cards, I found that phone was listed in my accounts on their website as if I had actually completed it. Of course, the phone was never sent to me. I sent a message to support and complained, but it's still displayed in my account listing, as if it were a device I had received. It is not.
Freedompop supposedly offers free plans, but that's not actually true. You have to give them $20 in order to use those plans. While that payment is supposedly refundable if you don't use it, I have absolutely zero trust for this company now. They are using fraudulent practices to try to trick customers into accidentally getting into a situation where they have to pay for a plan they're not actually using. A "free trial" that begins before you even get the product, and whose purpose is to catch out users who forget or are unable to cancel their plan is not "free" at all. It's a trap.