New Home Internet Connection Problems

I thought about switching when I first say the $50 home wifi offer, until I read it was introductory. My AT&T wifi has worked during hurricanes and has come on so fast after power outages. Also once I put my address in the cheapest Tmobile wifi is $80, ATT is under $70 a month. Not switching. Sounds like the wifi is the same as the phone service. 
 

Thank you for all the answers, I also have an older laptop and don’t need the frustration.