Okay, I am not sure if this answers your question or not. Cellular phones and home phones have the same numbering system.
Local calls within the same area code:
- seven numbers
- no area code needed
ex. 555-1234
Long Distance calls, or local calls within the same area code (ex. Cleveland has 3 area codes which are still considered "local". Because of cell phones, numbers are being taken up very quickly so new area codes are added. Bigger cities have even more area codes than just three).
- dial the number 1 first (I believe that identifies that you are calling a US number)
- then dial the area code (ex. I live in the area code 440, Cleveland's other two area codes are 216 and 330).
ex. 1-440-555-1234
You call numbers the same way with a cell phone or a regular home phone.
a 555 extension is used in television and movies as a "fake" number.
So since New Troy is fake, I think it's safe to make up your own area code, and I think it is also safe to use the 555 exchange as your first three numbers.
ex. Cell phone number (area code)555-1234
Home phone number (area code)555-3457
or something.
Hope this helps,
- Alicia