Can't use data when talking on Iphone 5s?

I was on the phone with someone else who has an iPhone and they said that their data doesn't turn off when they're on the phone. Is there a way for me to change it to where I can use data when talking on the phone? I checked the settings and couldn't find anything. Thanks!

Added (1). If that's the case then why would the data stop? I don't see the purpose it serves.

They might've lied to you. Data stops when you're on a call.

Why would you need to check facebook while talking to someone?

GSM phones can use data while on a call, CDMA phones can't. More of a consequence of the carrier than the phone itself.

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