Currently, the raw Global Navigation Satellites Systems (GNSS) measurements from android smartphone are widely used in precise positioning and mapping applications. The objective of our paper is to investigate the accuracy of low-cost single-frequency GPS Precise Point Positioning (PPP) using Xiaomi 11T smartphone. The single-frequency GPS PPP accuracy is evaluated for static applications in post processing mode. Two-hour static GPS measurements are acquired from both Xiaomi 11T smartphone and Leica GS15 geodetic receiver over Faculty of Engineering, Aswan, Egypt, reference station spanning two different days. Then, the observations are processed using two different PPP solutions, namely code-only and code and carrier phase PPP solutions. All data are processed using the Net-Diff software. To account for satellite orbits, clock and ionospheric errors, the International GNSS Service (IGS) final products are used. The PPP positioning accuracy and convergence time obtained through the Xiaomi 11T smartphone are compared with those obtained through the Leica GS15 geodetic receiver. It is shown that the single-frequency GPS PPP solution has centimeter-level positioning accuracy in easting and northing components for 30-min, 1-hour, 1.5-hour and 2-hour time windows. For the height component, meter-level positioning accuracy is obtained for 30-min, 1-hour time windows and centimeter-level for 1.5-hour and 2-hour time windows.