An older-model mobile phone that has been unlocked and is usually on a pay-as-you-go contract. So called because it can be used by transient people who don't have enough documents to be eligible for a contract.
"Wow, look at that ancient phone. Who uses one of those these days?"
"It's an immigrant phone, what do you expect?"
"It's an immigrant phone, what do you expect?"
by Finger Jokey September 19, 2012