Assuming you are talking about landline phones*, you need only look in your local telephone book, usually under the "LATA" (Local Access Transport Areas) page(s), or call your local phone company or look on their website for the information. Unfortunately, due to the myriad ways phone services can connect to your home, much less which tier of service you might have with them, there is no simple way of finding out which numbers are local to your particular phone. However, you can type something like "area code ### lata ###" into your favorite search engine, and see what you get (e.g., if you wanted to dial (012) 345 - 6789, then you would enter "area code 012 lata 345" without the quotes). * (most cell phone services include long distance at no extra charge, so that shouldn't be an issue)
There is no prefix.
Twentieth does not have a prefix. Just simple numbers do not usually have a prefix.
The prefix "un-" means not, so "unreal" would mean not real or imaginary.
/26
4607
If you split the word into its components, tele is the prefix (meaning distance) and phone (meaning sound).
The state that issues social security numbers with the 042 prefix is the state of Michigan.
None. Prefix 577 is assigned to the district of Columbia.
Hept is the prefix for seven.
Telephone country code +46 is Sweden, and numbers beginning with +46 7 are non-geographic numbers, including mobile phones, pagers, etc. Note that the charges to call a mobile phone in Sweden may be significantly higher than the charges to call a landline number in Sweden. If you are calling on a mobile phone, just enter the number in international format, beginning with +46 (including the plus symbol). The mobile network will automatically substitute any needed prefix(es). Otherwise, substitute your international access prefix for the plus symbol. The international access prefix is determined by YOUR location, not the location you are calling to. The most commonly used prefix is 00, but many countries use other prefixes.
The prefix 020 applies to London numbers. If you're phoning from a UK land-line, standard call charges apply - which will depend on what company you're with (BT, Virgin or whatever).
The word "carpet" does not have a common prefix or suffix that would help determine its meaning.