This is a cheap service BUT dont get me wrong is not bad at all, it is a good service, not an excellent, but good, it lets you do almost anything than other carriers
Pros
Good and cheap internet rates.
And most of the phone services from any carrier.
Cons
International calling not supported for mobile phones just land lines
On iPhone you will have problems trying to connect apps that require texting or calling
Sometimes calls just go missing and wont show on recents or missed.
Sometimes it will drop the call after answering.
It might have a problem where your voice wont be heard until you use speaker on your side.
You might not be able to receive some confirmation SMS of services like whatsapp, snapchat and similar apps.
Claiming warranty is a pain since they would suspend your account until you get the new device.
PonchoSDM about FreedomPop: Calling & Texting