There are no City codes, and numbers are 7 digits, 8 if cell-phones.
If you see a number with 6 digits, tag a "2" in front of
it.
NEW: if you see a 7 digit number that starts with 6 (which means it's
a cell phone), add ANOTHER 6 in front of it.
Cell-phones
Mixed D-AMPS/TDMA and GSM 850. If you have a quad-band phone
or tri-band cellphone that has GSM 850 then you can
roam or simply purchase a prepaid SIM card in Panama. Otherwise, your
cellphone/blackberry will not work here. More info here.
You can rent GSM cell phones from companies such as Cellular
Rent Express (tel. 210-9211, $6/day total), which is conveniently
located in the lobby of the Marriott Hotel. Another, Cell
Rent Panama (tel. 226-7302 / 6613-7302) which claims to have
delivery service.