Hey there! It sounds like the cellspot booster would have be a great resource here, so it's a big let-down that your phones don't seem to be gaining any additional signal! It's tough to rule out whether the issue is compatibility or if the booster is defective -- do you by any chance know anyone with a T-Mobile device who would be able to stop by so you could compare their signal experience to your own?
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The S6 (G920V) is partially compatible with T-Mobile. In particular, it has UMTS band 2 and LTE bands 2 & 4, which are the bands most commonly used by T-Mobile. The iPhone 7+ (A1661) should be quite compatible with UMTS bands 2 & 4 and LTE bands 2, 4 & 12. The iPhone should also work with WiFi Calling.
Have you done a network reset on both phones? Do you notice any difference between the behaviors of the two phones? I'd expect the iPhone to work better. How well does mobile data work? Where are you located (e.g. Zip Code)?
Just wanted to check in and see how things were going for you. If you haven't been able to confirm that the booster is defective, would you mind taking a look at the questions drnewcomb2 asked above? Thanks!
Just checking to see if you still need some help. Please take a look at the previous posts and let us know if you were able to get this resolved. Thanks.