is 'Are you free to call now?' natural?

Does it sound natural to ask 'Are you free to call now?' when you want to check if other people are free to talk on the phone?

I'd appreciate any help here. Thanks!

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Thank you all for answering my question. Really appreciate it.

So it seems that in the UK it's natural to say 'Are you free to call now?' if you're ask if someone is free to talk now while it's not in other regions.