<p>With the increasing use of smartphones for advanced positioning applications, the impact of environmental factors, especially ionospheric disturbances, on GNSS performance becomes a critical concern. This study evaluates the effect of ionospheric variations on the positioning accuracy of Android smartphones in India, a region with frequent ionospheric activity near the geomagnetic equator. Data were collected using two smartphones, Realme 8 5G and Samsung F23 5G, at a fixed outdoor location during early morning and noon sessions. The GNSS Logger application recorded raw satellite data, which was then processed into RINEX format for analysis. Signal strength was assessed using Carrier-to-Noise ratio (C/N₀), while positioning accuracy was quantified with 2DRMS and CEP error metrics. Results showed a consistent drop in C/N₀ values during the noon sessions across all GNSS constellations, indicating increased ionospheric interference. Realme 8 5G displayed significantly higher positioning errors, especially at noon, compared to the Samsung F23 5G, highlighting the influence of device-specific hardware on GNSS accuracy. Scatter plots further supported these findings, showing wider dispersion in position fixes during periods of high ionospheric activity. The study concludes that both ionospheric conditions and smartphone hardware play a crucial role in GNSS performance, offering valuable insights for developers and users optimizing mobile GNSS applications in equatorial regions.</p>