Ensure you are connected to Wi-Fi to avoid high data costs and improve stability. You can manage this in Settings > Connectivity > WLAN .
Thus, if you wanted Skype in Nokia C3 , you had to go through a gateway app. Skype In Nokia C3
It supported free Skype-to-Skype calls, low-cost international calling via SkypeOut, and basic file sharing for pictures and videos. Ensure you are connected to Wi-Fi to avoid
Nokia C3-00 is a classic QWERTY phone that runs on the Series 40 (S40) low-cost international calling via SkypeOut