You need only WiFi or 3G connection, and these apps will not use your quota minutes from your mobile service provider or text limit. The calls and texts are absolutely free from Google Voice.
Google Hangouts
Use Hangouts to keep in touch by sending messages to your friends anytime even in offline, making free video or voice calls, and hop on a conversation with one person or a group.
iTunes Link: Google Hangouts
Google Voice
Google Voice from Google allows you to access your Google Voice account right from your iPhone, iPad and iPod Touch. You can call and send free text messages to US phones. Google Voice enables you to access your voicemail messages with transcription and make calls with your Google Voice number. iTunes Link: Google Voice
Talkatone
Talkatone enhances Google Voice by letting you make calls/send texts. This apps allows you to make unlimited FREE calls and texts to anyone in the world over WiFi or 3G/4G without using any cell minutes.
If you are traveling overseas, you can use this to call and text US and Canada numbers for free. These apps will allow you to call and text from your iPad, iPhone or iPod. iTunes Link: Talkatone
Phone for Google Voice/Text
This is another apps supports phone calls and texting using Google Voice. This apps allows you to make free calls and text to any phone number in US & Canada, or any Gtalk users around the world. You can stay as online and chat and get connected with your GTalk friends, wherever you go. All these free apps allow you to use your Google Voice account to make free calls and text. iTunes Link: Phone for Google Voice/Text You need a valid Google voice account and to set up these Google account in the setting of these apps. This is the first time you are hearing about Google Voice, please refer here to setup your Google Voice number. Please refer to this post if you want to forward your Google Voice calls to your cell phone or land phone number.
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