Identify the frequency of the crystal used for outgoing calls in mobile phones.

Correct option is C

In mobile phones, the frequency of the crystal oscillator used for outgoing calls typically operates around 26 MHz. This frequency is part of the intermediate frequency (IF) used in communication systems, including mobile phones, to modulate signals for transmission.
Important Components of Mobile Phone-
(i) Charging IC
(ii) Antenna point
(iii) RAM
(iv) 26 MHz crystal oscillator