Hallo @mahmoud51,

What country are you in?

I ask,because different countries have different requirements

For example:

In north and south America you need a mobile phone that supports other mobile standards (tri-band or quad band mobile phone).

If you want to make phone calls in Japan or Korea, you need a UMTS-eanabled mobile phone. UMTS can not only used to transmit data,

but also to make phone calls.

The frequency, must also be correct. (850,900,1800 and 1900 MHz)

At first:

What is your country of residence?

Is the mobile phone useable?

In europe , the principle is as follows: "Room like at home".