Perhaps it's not the answer/reply you're looking for, but here's my advice:
1.- Post your Referral Code on Savings Spot Forum to earn $20 for each individual that successfully joins Visible.
2.- Join a Party Group to lower your monthly payment to $25.
You could pay only $5 each month ($40 Normal Price - $15 Party Pay - $20 Referral Credit = $5 Total)
Also, don't forget about WiFi calling. You can still use Visible's service outside of the U.S. of A., as long as you have access/connection to internet via WiFi.
That's the way I use my phone, when traveling/working overseas.
Cancel the service and get a new number on return. That's the best suggestion i can think of. It doesn't make sense to pay for more than 8 months.