Oh that's easy - it's 3. They have more negative online reviews than for any other UK network, were ranked lowest for customer service in a Which? Magazine reader survey of December 2010. They're...
US international calling code: 011
Country code for UK: 44
You should dial calling code, country code, then phone number minus any leading zero.
So, for example, UK mobile number 07234 123456 is...
No, most phones use signals from towers and a "switch" that turns it into a landline call. If you aren't close enough to a tower you won't have a signal to use it.
For me, definetly giffgaff. For £10, you can get 250 minutes and TRULY unlimited texts and internet. By truly unlimited i mean giffgaff doesn't have a fair usage policy line normal providers. Fair...