The SkyPhone supported by FC2 app is operated with the SkyPhone service and allows you to make free calls to SkyPhone.
Besides, you can use your mobile phone number verified in the app as a SkyPhone number.
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Unfortunately, calls from SkyPhone to SkyPhone supported by FC2 were only available with 8 digit SkyPhone numbers.
However, now you can make SkyPhone calls to SkyPhone supported by FC2 with verified mobile phone numbers.
Note: You can call neither landlines nor mobile phone numbers which aren't verified in SkyPhone supported by FC2.