If I have a phone locked to the Vodafonr network (eg the Smart Turbo 7) - I know it needs to be unlocked to use another carrier's SIM. But what about roaming (using the $5 daily roaming). Does the phone need to be unlocked for that?
You should be able to use roaming. The phone would not need to be unlocked. Network Locked means you wouldn't be able to use another carriers SIM as you have mentioned.