To write a Greek mobile telephone number in correct international format, begin with the international telephone country code for Greece, +30, followed by the ten-digit Greek telephone number, using only spaces to separate groups of digits. For example, +30 6xx 000 0000. Do not use anything except the single plus sign at the beginning and digits and spaces after that. In particular, do not ever use any parentheses, dashes, dots, or other punctuation.
(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.)
Dial the number exactly the same way you would if the other person was in Australia. The mobile network will locate them wherever in the world they are roaming. The easiest way is to program the number into your mobile in full international format (in this case, replace the trunk prefix 0 of the Australian number with country code +61, including the plus sign). That way, it will work even if you are roaming in Greece or Japan or Argentina.The same principle applies for any mobile phone from any country, roaming in any other country.
India Is the Largest Mobile phone Users in the World
Indonesia
Chad uses telephone country code +235. To write a mobile number in Chad in international format, just put +235 in front of the domestic number.
Estonia is the first country allowed to vote through mobile.
china
Pakistan
Canada and america
Don't knoe
Maybechina
The Philippines provide Cherry Mobile phone services. There are various locations that provide this phone service like: kiosk, exhibit or store for your mobile needs.
The largest mobile phone operator in the world, by number of subscribers, is China Mobile from China. At the end of 2010, they had 584 million subscribers.