Saskatchewan
California has 31, with #32 scheduled for 2015. Texas has 26.
There is more than one area code. See link for Illinois area codes.
Texas has 24, but California has 30, with the 31st scheduled for Nov. 20, 2012.
country
The United States does not have separate area codes for mobile phones. Mobile phones (cell phones) use the same geographic area codes as landline phones. Florida has more than a dozen area codes, so you need to be more specific about where in Florida.
It's not easy, since they are two completely independent systems. Each area code has many different ZIP Codes, and sometimes a ZIP Code may have more than one area code.
In 2009 the area code 773 stopped being in use for the city of Chicago. Instead the state employed a wider area code for the city and its suburbs rather than using two or more area codes for the full area.
California has more than thirty telephone area codes. You need to be more specific.
Yes, there are several area codes that have more than one time zone. In fact, area code 867 in northern Canada has four time zones!
The United States uses the same geographic area codes for cellphones and landlines. There are more than 20 area codes in Texas.
Germany is country code +49. German area codes beginning with 049 (or +49 49 in international format) are in the area of Ostfriesland and Emsland, but you need one or two more digits to be specific. Germany has more than 5,000 landline area codes.