If you are seeing a Fongo Connection Failed message when launching Fongo, please check the following possible reasons:
1) You are connected to a public wifi (Tim Hortons, McDonalds, etc.) in which you have not agreed to the terms of service, open a web browser on your phone and try to browse.
2) Some public wifi and corporate wifi networks do block SIP communications and as a result, Fongo will not connect. You may be able to circumvent this by using a free anonymous VPN service like the Opera VPN Service.
3) If you are on T-Mobile in the US (or any other IPv6-only network) on iOS 10.2+. If you have Fongo for iOS 3.9.10+ you may turn on the 'Allow IPv6 Connection' setting in the app. If this doesn't work as a workaround, please use Opera VPN to connect: Opera Free VPN
4) We have found some Internet Service Providers and Mobile Carriers in certain parts of the Middle East and Northern Africa are blocking SIP communications and as a result, Fongo will not connect. You may be able to circumvent this by using using a free anonymous VPN service like the Opera VPN Service.
5) You may not have an internet connection, please try web browsing, or other apps on your device to ensure your data connection is currently active.
6) The WiFi router that you are connected to may have a setting called SIP ALG enabled. If you are able to disable the setting please do so. You can also circumvent this setting in Fongo 3.7.9+ by enabling the 'Alternate Fongo Connection' setting in the app.
7) We may be experiencing a service outage, please check http://status.fongo.com for updates.
8) Try logging out of the app and then log back in or try rebooting your phone.
You can download the Opera VPN Service Below.