My wife and I had the same problems (incoming calls went straight to voicemail and delay receiving text messages) for a while. We went to T-Mobile store and had SIM cards replaced, but the problems were not resolved. Out of frustration, I switched from 4G LTE to 2G for both our phones, we have been able to receive calls without any problem and text message delay without delay for more than two weeks now. Personally, I think that all the subject problems are related to T-Mobile 4G LTE itself. T-Mobile may have introduced bugs into its 4G LTE during the latest update by accident (?).
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