Is it possible you’re in a 2G service area with degraded services? T-Mobile is keeping it alive until 2020, but it’s being depreciated in certain areas - none of us can tell you where this is happening so even we don’t know enough to tell you about your specific situation with 2G availability.
The best we know (and can advise you on) is how many months owners of these old phones have left before they need to replace them, if we know the carrier they use.
Find a phone with 3G/4G bands and see if you get better results. If you do, then you’re in a 2G depreciated area.
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