Google Fi customers who are new or existing can get the Samsung Galaxy Z Flip3 at $400, a substantial discount from its original price of $999. The only conditions are that you must purchase the phone and keep it on a Fi account for at least 30 days to receive the rebate in the form of a credit. This deal is great if you are an existing Fi subscriber who had your eye on Flip 3 already.You can't buy the phone if you are an existing Google Fi customer. To receive the discount, you must keep your phone in use for at least 30 days.Non-Fi subscribers must activate their phone on a full-service plan and must transfer the existing number to Fi. If you want to get a new Fi number, you won't receive the bill credit.A $150 credit will be available on Samsung's website for purchases of new Flip 3. All you have to do is order the device before August 26th, and register it with Samsung. The phone will be $550 cheaper thanks to the stack discount. This is a great deal for a new device.According to Google, the Fi promotion is only valid while it is live on fi.google.com. The Samsung credit is valid until November 9th.