The iPhone 7 can directly connect to the Verizon Wireless network through the 4G radio. Why would you need it to connect first to a wifi router for its Internet access?
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
The expense of an added device to provide wifi is probably more than the expense of simply increasing your data allowance and using your cellular connection for the 6 week timeframe. Skip the intermediate step of a device that also uses cellular data to give the phone access to wifi - and just use the phone's cellular connection.