True that Freedompop voice is "data only" but they offer 2 types of services.
1. They have the CDMA service that comes with a phone and runs on the Sprint network in the US. Data is upto 1GB of free data per month
or
2. They offer a Global "Sim only" option that is GSM based and runs on the AT&T HSPA+ network in the US and works in many countries around the world centered mostly in Europe (excludes Canada). SIM regularly goes on sale for $1 and you get upto 700mb data per month. This option works with any unlocked GSM capable phone.
1. They have the CDMA service that comes with a phone and runs on the Sprint network in the US. Data is upto 1GB of free data per month
or
2. They offer a Global "Sim only" option that is GSM based and runs on the AT&T HSPA+ network in the US and works in many countries around the world centered mostly in Europe (excludes Canada). SIM regularly goes on sale for $1 and you get upto 700mb data per month. This option works with any unlocked GSM capable phone.