So I just switched over from At&t to T-Mobile 2 days ago and so far everything worked out fine until I walked into the Culver City Target last night. Literally had no signal while in the store for 10 minutes... walked around the whole store too and checked the phone (I was trying to look something up). Any T-Mobile customers out there with similar problems? I'm using a 5S and reception has been decent through out Los Angeles, I lose reception in certain spots of my office at work but it's not much better with At&t (down to 1 bar with Data running really slow). Overall the Tmo speed (both LTE and 4G) blows At&t out of the water. But I don't recall completely losing reception indoors for at least the last 5 years... this was common around 2002 but I was shocked to see it happen a decade later. Is T-Mobile known for this or is this an intermittent issue?