Does international calls add-on expire?

Hi,

Yes, you have 30 days off your next billing cycle for use it.

How long does it take to activate an Add-On? How long does it last?

Add-Ons are active immediately. They’re valid until the end of your next payment cycle.

In other words, if there are 10 days left on your current payment cycle, your Add-On will be valid for approximately 40 days.

Hi David,
For all add-on, they are usable for the rest of the billing cycle in which you bought them + the next billing cycle. So between 31 days (if you buy it at the very end of a billing cycle) and 2 months (if you buy it at the very beginning of a billing cycle).
If you call US really occasionally and not for long calls, you can also use your wallet to pay the calls. I guess it's around 30-35cts / min.

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It expires you have a month to used it