Dial:
011 = international access prefix from the US
44 = country code for the UK
7XXX = mobile code (7400 through 7999)
(6-digit mobile number)
# = pound sign tells the telephone switch not to wait for more possible digits
If the US mobile phone is in international roaming mode, you may be able to dial its normal US number. If the phone has swapped in a UK SIM card, you will need to dial the UK number.
No - usually the mobile networks will do all the 'hard work' for you.
The mobile phone number remains the same no matter where you take your phone - callers do not have to guess where your phone is before they dial you. In this case, the US caller would call you in the same was as calling any other UK telephone number: international access code 011, then country code 44 for the UK, followed by the full mobile number ignoring the leading zero. For example, 07345 345678 would be dialled as 011 44 7345 345678 from the USA.
NO!
The LG Voyager mobile phone is not available in the UK. LG Voyager mobile is a CDMA phone, which does not work outside the US.
There is not difference - just a persons preferrance in what they call it. In Europe, they use the term mobile phone more and in the US we call it cell phone.
Assuming it's a contact in the phone's memory - just do exactly as you would if both phones were home in he UK. The network will sort out the logistics and connect both phones.
Enter the number into the phone and call it.
The physical location of a mobile phone is not relevant to how you dial it. To call a US-based mobile phone from the UK, dial 00 1 and the area code and number.
You can't.
The same way you do with any other phone number.
To call from the US to an Australian mobile phone, dial 011 = international access prefix 61 = country code for Australia the Australian mobile number, omitting the leading 0 To call an Australian mobile that is roaming in the US, dial the Australian number as you normally would.