I live on the Canada border and am constantly roaming with my Samsung gs4, I just got the phone Friday and cannot get it to stop roaming, I went to the local Verizon and she did something and told me it would work but it didn't.
You can turn off data roaming by going here: Settings > More > More Networks >Mobile Networks > Global data Roaming Access > Check Deny data roaming access.
I don't think there is any settings to turn off call roaming, unless you put the phone in airplane mode
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