What is the best secondary telephone line app since Google Voice apps are no more?

[gottago]

I am using a Lumia 925 with WP 8.1 on TMo. I need a dependable second telephone line (business use) with the ability to call out (w/CID). Sending and receiving SMS would be nice but not required. Are there any apps that can use either my minutes or my 4G LTE connection to provide a dependable secondary telephone line?

Thanks...

 

[SamJHannan]

I'm not sure of the technical aspects, but have you considered Skype?

 

[errole]

Google voice is free though over everything else

 

[gottago]

Yes. Skype was my first go to but I am concerned with the dependability. I have missed a couple of personal calls/texts and am naturally afraid to test on business. This maybe my fallback if all else fails.

 

[gottago]

Google voice is free though over everything else

While I certainly understand FREE, dependability is the most important factor. Thanks...