I'm on Virgin Mobile USA and I've got a Samsung J7. I know the phone and network are CDMA but the device itself has a SIM slot.

I'm currently in Spain and obiously don't have service except for using my device on Wi-Fi. I called to ask about unlocking it and I was told that once my phone is unlocked from Virgin, it cannot be put back onto my network when I get home. Also, that the SIM card slot is only used for internet. Does anyone know if any of this is true?

What I'd like to do is either use a network temporarily here in Spain for voice and data, or maybe even preferably just data. Is there any way this would be possible? I can't seem to get a clear answer from other forums because 1) the USA is one of the very few places that still uses CDMA, and 2) this phone is one of the very few Virgin Mobile USA phones that even has a SIM slot.

I'm not an expert so please bear with me. Do I have any options at this point other than just connecting to Wi-Fi sporadically?