Yes as they were not always as widely as available as they are today.
no
We would not be able to use our mobile phones without them
0066, then the number without city code....
Without direct physical access to the phone, you cannot bug it. The only other way to listen in would be to have a job that allows you to do so within the mobile phone's service provider.
You have to be more specific as to what type of phone, and with or without contracts. If you go to buy mobile with contract the you get most of mobile free but if you buy PAYG or Sim Free mobile then you pay actual price of mobile. So its on you that which phone you want and what plan you need.
A mobile OS (Operating System) is a piece of software that allows you to navigate and operate your phone. Without it, having a phone would be pointless.
have a look at your mobile phone
Its not possible unless the manufacturer provides it with the phone.
It depends on your mobile phone. There are different features for different models.
I believe you can add or change a device on the Boost Mobile website.
you can at spint
How i can formatted nokia x201 phone