Here are my top recommendations for Apps that provide a 2nd line for those that need it, be it for business or personal use, I have Bolded their main features and underlined the unique features each app offers: 1) Convoi - Cost = $0 / Month - It provides you with a FREE phone # (US and Canadian #'s available) - Unlimited Talk + Text over Cellular Data / WiFi to US and Canada #'s. - Call Forwarding available - Conference Calling - Voicemail - What I love about this app is that you can forward the calls from your Convoi # to your primary # if needed, so doesn't matter what # people call you at when you are back home, you can still be reached and it is not limited like any other App, it is a true VoIP app and allows you to call any US/Canada # and Unlimited Texting. Been testing it out for months and used it while I was in Australia. I had forwarded my cell # to Convoi # actually so my phone rang regardless and only thing I missed out on was Text messages to my primary cell # but that is no big deal. 2) Ring.To - Cost = $0 / Month - Unlimited Talk + Text over Cellular Data / WiFi to US and Canada #'s.(You will be required to port in a # in order to use the App, which you can easily do so from Google Voice or if you wish to port in your primary # you can do so -- Can only port in US #'s) - Unlimited Call and SMS / Text Forwarding to any US & Canadian # - Allows you port in / port out large amount of #'s if you want to for some reason keep / hold onto many #'s. (US #'s ONLY) - Voicemail - SMS Auto reply available 3) Google hangouts/Voice - Cost = $0 / Month - Unlimited Talk + Text over Cellular Data / WiFi to US and Canada #'s. -- I find it a little bit messy app(s) to use compared to Convoi and Ring.To especially on iOS as the integration is not possible for google to make. - Call forwarding available - Voicemail w/ Transcription In the past I have used & tested the following VoIP solutions for extensive periods of time on my iPhone: Skype, Line 2, TextME, TextNow, TextPlus, FreedomPop However none of the apps provided all the necessary features or the call quality / notifications did not work well, or had some other issues that ruined the user experience overall. PS if you guys have a better suggestion for Thread Title, please let me know, Thanks.