Q: Why will my hotspot on my 5's turn off durring calls

Hi airborneapple,

Welcome to the Support Communities!

The article below may be able to help you with this.  I've quoted some pertinent information from the articles for you.  Click on the link to see more details and screenshots. 

iOS: Understanding Personal Hotspot

http://support.apple.com/kb/HT4517?viewlocale=en_US

iOS: Troubleshooting Personal Hotspot
http://support.apple.com/kb/TS2756

See how many devices are using your Personal Hotspot. Depending on your wireless carrier, the number of Wi-Fi connections may be limited to three devices at once.

 

Your device will stop broadcasting Wi-Fi if you put it to sleep or if 90 seconds elapse and no connected devices use Wi-Fi. To share your Wi-Fi network again, tap Settings > Personal Hotspot.

Additional Information

• Depending on your cellular network connection, incoming or outgoing phone calls may interrupt your Personal Hotspot connection. After you end the call, Personal Hotspot should automatically reconnect with your devices.
• If you're outside your wireless carrier's network coverage area, you may be roaming.
  • To use Personal Hotspot, you need to turn on Settings > Cellular > Data Roaming.
  • Data roaming charges will apply. Check with your wireless carrier if you're roaming to verify any additional charges.
• When Personal Hotspot is on, your iOS device automatically shares your Internet connection with your computer when you connect using USB. For example, when you connect your iPhone to your computer to charge or sync with iTunes. To avoid unnecessary data charges, turn off Personal Hotspot when it isn't in use.

Cheers,

- Judy