In most countries you can either sign up for contracts with regular data allowance, or buy pay-as-you go phones which require topups. It sounds like if you bou

In most countries you can either sign up for contracts with regular data allowance, or buy pay-as-you go phones which require topups. It sounds like if you bought a pay-as-you-go sim card in Korea that it would immediately give you the slower unlimited connection without needing to pay for allowance first.