List of top GNSS / GPS Questions on Carrier Phase Observation Model asked in GATE GE

The carrier phase observation model in GNSS is given as
\[ \phi_A^i = f\delta^i - \frac{\rho_A^i}{\lambda} - f\delta_A + N_A^i - f\delta_{\text{iono}} + f\delta_{\text{tropo}} + \epsilon \]
where \(\phi_A^i\) is the observed carrier phase in cycles, \(f\) is the frequency of the carrier in hertz, and \(\lambda\) is the wavelength of the carrier in meters.
What is the unit of the ionospheric (\(\delta_{\text{iono}}\)) and tropospheric (\(\delta_{\text{tropo}}\)) delay terms in the given equation?