T-Mobile users have had a few headaches recently, but it was just their turn. Outages need to be expected even with wirelines. The variable is the average downtime per service. As part of our study about replacing the home land line, we found wirelines to be the most reliable, but cellular came in at a surprisingly close second place.
In my own home, we have never experienced a wireless outage, but we did have a 24-hour outage on the land line which includes the DSL connection. Phones connected through cable TV go out several times a year, either at the neighborhood level, or with their switching equipment.
Earlier in this decade, we reported difficulties with cellular companies providing enough trunks for outgoing calls, but those reports have become rare. Our difficulties of making calls then with both Sprint and Verizon Wireless were no less frustrating, but look at the percentages...they're very low. Like we found for TheUnWiredHome, it's always smart to have a backup, like a phone with a different wireless carrier. You have one in your glove box don't you?