Effective July 1, 2020. Holding a phone in your hand while operating a vehicle in Indiana is against the law and a ticketable offense.
If you have Bluetooth you are recommended to use that or simply wait until you are not on the road anymore.
https://www.wthr.com/article/news/local/indiana/indiana-hands-free-driving-law-takes-effect-july-1/531-81d687b5-e38c-4514-bc45-780579b80179