Dialer+ is a SIP-based softphone for iPhone , iPod touch and iPad support T9 Input Method for english and chinese pinyin Standard Phone Features Fast Contact Search Use phone pad to find contacts by names, initials or any part of the numbers. support T9 Input Method for english and chinese pinyin iOS 4.0+ Background Support Supports GSM calls when the network is unavailable or slowly Multiple Account Support Auto switch to best service provider when use multiple account Pre-configured VoIP providers list Call display Speakerphone, Mute and Hold Call history Contact List and Contact Favorites - leveraging the iPhone Contacts Ringtones and contact avatars Multiple incoming Call Support - swap between two active calls; merge and split calls Audio codecs include G.711,G.722, iLBC ,Speex and GSM, Make an in app purchase to add G.729 for great performance over 3G networks Support for RFC 2833 DTMF VPN Support uPNP Support iPhone 4 Retina Display SupportFIND CONTACTS FASTER- Directly type contact names on dial pad. Type tj, tom or jack for Tom Jackson- Type 6789 for any phone number consisting of 6789. (e.g., 315-909-6789, 487-678-9847)- Search contacts by their company names, email, address or notes.Advanced Features Network Traversal - Application Managed, Server Managed or User Specified; STUN & ICE & uPNP Media Efficiency and Quality - Echo Cancellation, and VAD (Voice Activity Detection) QoS (Quality of Service) Security and Encryption via TLS and SRTP DNS SRV record lookups***NOTES - IMPORTANT, PLEASE READ***SIP - Dialer+ Softphone is a SIP Client, not a VoIP service. You must have service with a VoIP provider that supports use on a standard SIP client to use it.*IMPORTANT: VOIP OVER 3G NOTICE*Some mobile network operators may prohibit or restrict the use of VoIP over their network. They may prohibit the use of VoIP or impose additional fees when using VoIP over their network. By using the app over 3G, You agree to learn and abide by your cellular carrier's network restrictions. Dialer+ 's Author will not be held liable for any charges, fees or liability imposed by your carrier for use of VoIP over 3G.