Can you turn off incoming calls while using iPhone 5s as a hotspot?

I have an iPhone 5s on Verizon and use my unlimited 4g data plan as a hotspot.
Is it possible to stop incoming calls from coming in while using as hotspot? For the most part, it is not a problem, but if on a webinar or conference call, I do not want to drop the webinar of conf. call.
Thanks in advance!