<https://community.fxtec.com/topic/3782-experience-so-far-with-pro1x/#comment-66096>
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"I received mine recently, but I believe it is from the same batch that has been sitting in the warehouse since July. I don't believe either hardware or firmware has been changed(it still has the June 2022 security update).  There is no indication there was a \"later batch.\"\n \n\n\n\tThe secret of my success with connectivity seems to be, locally, the ability to hold onto band 4, which probably has more to do with the choices T-Mobile has made in their implementation here where I live than anything to do with the phone itself. I have no idea if the fact that I use Ting Mobile, a T-Mobile MVNO, not T-Mobile, has any part in this.  Since my Pro 1, on T-Mobile, also holds onto Band 4, I suspect not.  \n\tFrom your post about travels up the West Coast in the connectivity thread, the West does not have as much coverage by Band 4 on T-Mobile. Instead they seem to be using lower frequency bands or the bands T-mobile has that the Pro1x doesn't.  I still think @claude0001's theory that somehow the Pro1x doesn't handle lower frequencies well is reasonable. \n \n\n\n\tI wish there were LTE coverage maps that actually mapped out band coverage.\n \n\n\n\t \n \n\n\n\t \n "
<https://community.fxtec.com/topic/3782-experience-so-far-with-pro1x/?tab=comments#comment-66094>