Save 50% when you switch to Sprint from Verizon, AT&T or T-Mobile For a limited time, Sprint will save you up to 50% on your Verizon Wireless, AT&T or T-Mobile bill if you switch to Sprint and bring your phone number. Savings continue until January 8th, 2018. AT&T: Discount offer limited to 300MB, 2GB, 5GB, 15GB, 20GB and 25GB plans. T-Mobile: Discount offer limited to 2GB, 6GB and 10GB plans. Verizon: Discount offer limited to 1GB, 3GB, 6GB, 12GB, 18GB, 20GB, and 25GB plans. Call Sprint at (844) 257-3516.