Different frequencies are used in different countries. There is no 'correct' answer to your question.
In most places (but not all):
Cell phones around 650 - 700 MHZ, 880MHz to 980MHZ, 1800 - 1860MHz.
Wireless telephones 1.6 - 1.7MHZ, 36 - 37MHZ, 1900MHz
WLAN 2.4GHz - 2.5GHz, 5.1 - 5.2GHz
The primary distinction is by frequency band but there are different modulation methods and data rates used in most of them. Cell phones are polled by a control station to discover which are in range then allocated time slots so many can share the same frequency.
Brian.