Speek International Calls app for iPhone and iPad

Speek offers simple User Interface and super audio quality VoIP calls in affordable rates. Speek works on all iOS devices and supports calling over WIFI/EDGE/3G/LTE.In order to use these app, end users need to login using their mobile number.

Key features include:

1. Lowest battery usage with highest reliability / stability on App store.
2. Lowest latency.
3. Exceptional voice quality.
4. Bandwidth normalization.
5. Voice/Video packet negotiation
6. Bluetooth support.
7. Excellent audio quality, even on older devices.
8.Supports calling over WIFI/EDGE/3G/LTE.
9. SIP stack fully compliant to RFC.
10. Background / multitasking support.
11. Speakerphone, mute and hold.