Could I Get Some Help ??

Hi Everyone,

I am a "newbie" in the smartphone arena. I had a BB Curve years ago (but I would not really say it was "smart"). I now have a T-Mobile Samsung Exhibit II 4G phone (Pre-Paid). I have used it on my wi-fi signal in my house a couple of times. I just looked at my T-Mobile Acct and it
showed that I had used 27 minutes of my alloted 100 min Pre-Paid card.

I immediately call a CSR at T-Mobile and asked why was 27 min showing USED on my account. Because I only used my calls on my wi-fi (home) connection. She stated that the Wi-Fi calling feature is used ONLY to "enhance" my voice signal NOT instead of my voice signal.

And that I will always get billed for all of my calls - EVEN if I am using my wi-fi connection. No one explained that to me prior to my purchase, other than it has feature called Wi-Fi Calling.

Anyway - is there any Android app that works well AND will let me make (FREE) Voice calls over my unlimited DATA plan ??

Any help and assistance will be greatly appreciated. TIA, amorg7777.

With TMobile you need the Free WiFi Calling feature added to your plan. There are many limitations and I am not sure if you can get it for prepaid plans. They are very clear on this site and here is a small excerpt:
Wi-Fi Calling Overview

Wi-Fi Calling is a free feature for T-Mobile customers with a Wi-Fi and Wi-Fi Calling capable phone. Wi-Fi Calling is an excellent solution for coverage issues in and around the home or wherever cellular coverage is limited. Minutes used while connected to the Wi-Fi network count against available rate plan minutes unless the Free Wi-Fi calling feature is added to the rate plan. With the Free Wi-FI Calling feature, voice minutes are no longer decremented on calls over Wi-Fi.