Stay connected with AT&T in Ontario. We offer phones, tablets, smartwatches, and connected devices from all of your favorite brands. We also offer wireless data plans in Ontario for every need. Enjoy the flexibility of an Ontario prepaid phone plan with no annual contract and no credit check. Find the right data plan for all your text and data by choosing one of our popular unlimited data plans. Get a new device and use our nationwide AT&T 5G service, which comes with all of our unlimited data plans for no extra cost.