Credit: Edgar Cervantes / Android AuthorityMint Mobile’s $180/year ($15/mo) unlimited plan is normally for new customers only.Some existing customers have reported getting the same offer or credits toward an upgrade by calling to cancel and requesting a port-out.Results vary, so only try this if you’re ready to switch carriers if Mint doesn’t extend the deal you’re looking for.Right now Mint Mobile is offering new customers a full year of unlimited service for just $180 upfront, which works out to just $15 a month. This is a heck of a deal, considering the cheapest postpaid carriers start around $50. The only real downside to this promotion is that you can only sign up if you’re a new customer.The good news? There may be a way to get this same offer even if you’re already on Mint, at least according to vtomaster on Reddit and several others who commented in the thread.