I recently visited Europe for a week and purchased a prepaid SIM on the Vodafone network to use while I was there. Everything worked great. However, when I came back home to the US and put my Verizon SIM back in the phone, I no longer have mobile data working. I can make and receive calls without issue, and WiFi and Bluetooth are no problem.
What shall I do to regain access to Verizon's mobile data network?
P.S. If it makes a difference, I have a Samsung Galaxy S4.