Hello, I bought SM-G550T (Galaxy On 5) at about the end of last year (or was it this year January? I can't remember precisely) with Pay As You Go plan at about $50 if I recall correctly.
About last Wednesday, I went to the store where I bought the phone and they told me that if I don't pay at least $10 by the end of this year, my phone number will basically be deleted.
Since I am leaving United States for about 3 years after the coming summer, I don't plan on keeping my phone number. In that case, do I need to return the device?