There is not country codes for phone numbers inside the USA. Country code 90 is from Turkey.
The number 90 is written out in words as such: ninety. You should spell out a number rather than write it in number form in particular scenarios, such as if you are beginning a sentence with a number.
Turkey has country code +90(dialed as 00 90 from many places). All numbers are 10 digits after country code +90. Note that you must omit the trunk prefix 0 from the beginning of the Turkish number when calling internationally.Istanbul is area codes +90 212 (European side) and +90 216 (Asian side).Ankara is area code +90 312.The Turkish Republic of Northern Cyprus is area code +90 392.All other geographic area codes begin with +90 2, +90 3, or +90 4.Non-geographic numbers begin with +90 850.Mobile numbers begin with +90 50, +90 53, or +90 54.There are no valid numbers beginning with +90 0, +90 1, +90 6, +90 7, or +90 9 (except premium numbers in +90 900).(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
'00' is not part of the country code, it is a commonly used international access prefix. Country code +90 is Turkey, and +90 542 is a Vodafone mobile.
00 isn't part of the country code, it's a commonly used international access prefix. Country code +44 is the United Kingdom. A number beginning with +44 75 is a UK mobile phone.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, and many other countries use different prefixes.)
Several countries have the domestic dialing code 0900, often for premium-rate services.0900 is not an international code, because country codes never start with 0. In any case, country code +90 is Turkey, but there are no valid numbers beginning +90 0.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Right now (September of 2012), there are 90 different FM radio stations all licensed to broadcast on 92.9 in different parts of the country. If you don't give us the call letters of the station you're listening to, or at least the city you're in when you listen to it, there's no way to know which one of those 90 stations it is. And they all have different phone numbers.
The number +900080002050 in your text messages is from Turkey whose Country calling code is +90.
Telephone country codes never begin with zero.Country code +990, dialed as 00 990 from many places, is an invalid code.Country code +90, dialed as 009 90 from many places, is Turkey.To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +994 or +90), omitting any dialing prefix.(The plus signmeans "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The number of business days depends on what country you are in, since each country has a different holiday schedule.
It is 90 because 90% of 90 = 81
The number is the square root of 90
multiply the number by .90 or just.9 like 90% of 100 is 90