Review: Samsung Gravity Smart
The calling application is the stock Android calling app. There are four tabs across the top to switch between the dialer, call log, favorites, and contacts. From the dialpad, you also have access to voicemail.
In-call options include the typical features, such as adding a line, sending the call to Bluetooth or speakerphone, turning the dialpad on/off, etc. All of the features worked properly.
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The Gravity Smart supports T-Mobile's Wi-Fi calling feature, too. When the Gravity Smart's Wi-Fi radio is active, it can make calls via your home Wi-Fi network. The Gravity Smart will not roam onto the cellular network if you step out of range from your Wi-Fi hotspot, however. You can also send SMS messages via Wi-Fi. In my experience, these features worked well.
The contact app, too, is stock Android. The Gravity Smart supports thousands of contacts, each with multiple fields for phone numbers, email addresses, web pages, etc. The Gravity Smart makes it easy to search through the contact database with but a few taps, as well as sort contacts into groups and/or favorites.