Callwise

This is easy to use Callswise softphone for existing Callwise customers to download and access their accounts via their iPhone.

This app allows Callwise customers to make crystal clear, echo-free voice calls through Wi-Fi, 3G, 4G, and 5G data connections.

With flawless background operation, the app is optimized to use as little battery as possible while ensuring reliable incoming calls as you roam between networks.