Just dial the UK mobile number as normal. The network will sort out the logistics.
If you are calling from a UK mobile to Australia, dial 00 (international prefix from the UK) 61 (country code for Australia) and then the Australian number, dropping the leading 0 To call from Australia to a UK mobile, dial 0011 (international prefix from Australia) 44 (country code for Australia) and then the UK mobile number, dropping the leading 0
An Australian telephone number beginning with 04, or with +61 4 in international format, is a mobile phone.
Dial 0061 (the international access code for Australia) - then the number in full.
Dial 0061 (the international access code for Australia) - then the number in full.
First of all, replace the leading 0 of a UK domestic mobile number with country code +44. For example, the mobile number 07700 900123 becomes +44 7700 900123. If you have a GSM mobile, enter the number in international format, beginning with +44. If you have a non-GSM mobile, replace the plus sign with the international access prefix 011.
In Australia, telephone numbers beginning with 04 (or +61 4 in international format) are mobile phones, from any part of the country.
Dial the international access code for NZ (0064) - followed by the full mobile number.
To call an English mobile that is roaming in another country, dial the English mobile number exactly the same way you would if the mobile were in England. English mobile numbers begin with +44 74 through +44 79. On a GSM mobile, enter the number in international format, beginning with the plus sign. Otherwise, replace the plus sign with your international access prefix (most commonly 00, but many countries use other prefixes. Australia uses 0011 and other prefixes.).
+44 is the international code for England.
For American numbers, prefix with country code +1
There are a couple of different ways to read your question.How do you call someone in Australia from a UK mobile?The telephone country code for Australia is +61, and you must drop the trunk prefix 0 from the domestic number to put it in international format. For example, Sydney's area code 02 becomes +61 2. On any GSM mobile phone, anywhere in the world, you can dial the number in full international format, beginning with the plus symbol.How do you call a UK mobile when that mobile is in Australia?The physical location of the mobile does not matter in terms of how you dial it. Just dial the UK mobile number the same way you do when the mobile is in the UK. Even if you also are in Australia, you still have to dial the UK number. The country code for the UK is +44, and again you drop the trunk prefix 0 from the domestic number. (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.)
There is no 3 mobile operator in Australia. In fact, there is no area code in Australia. All cell phone calls seem to all be local and not have any mobile operator.