 Second and third month of monthly base service fee waived for new customers with the purchase of a phone and activation by July 31st, 2024. Taxes, fees, and third-party charges will apply. See website for additional details. Want to keep your gas-powered engines running like new? Stable's proprietary formulas are proven by third-party testing to outperform the competition in keeping fuel fresh, preventing corrosion, and cleaning the entire fuel system. With Stable.