As of October 2012:
In addition, in Canada:
* The tiny town of Hyder, Alaska, is in area code 250, but calls there are billed as calls to British Columbia, Canada.
No. The entire 713 area code is an overlay with 832, which also overlays the 281 area code.
Albuquerque is in area code 505.
There are too many too list here, and most states have more than one area code, but many websites provide this information. See link.
No, there are others, such as Maine.
The same local telephone number can exist in many different area codes. (After all, that's the whole point of area codes.) If you know where the telephone number is from, and if that place has only one area code, you can find out that way.
No, Cricket Wireless offers service in several area codes.
One can find information about the area code 813 at the White Pages website or at the Area Code website. The area code has been in use since 1953 and serves the Tampa area.
Springfield, IL utilizes one area code which is area code 217.
North American area code 829 is one of the three area codes for the Dominican Republic. Calls from the United States to area codes 809, 829, and 849 will incur international call charges.
In general, yes, but not always. Cellphones in the United States use the same geographic area codes as landline numbers. A person may have a cellphone in a different area code from their home because they moved and kept the cellphone number from their previous home town, or because they requested a number in a neighboring area code (e.g., live in one area code but work in an adjacent area code).
The area code 215 is the North American telephone area code for the Commonwealth of Pennsylvania. The area code 215 was one of the original area codes established in 1947.
If you have only the 7-digit number for a cell phone number in an area with more than one area code, there is no way to determine which area code it belongs to, other than guessing. In particular, in the United States and Canada (except for numbers in area code 600), cell phones use the same geographic area codes as landline phones, and in all cities and even most rural areas, you can take your telephone number with you, even switching from cellular to landline or vice-versa.