Many thanks everyone i 'm sorry for this late reply.I want to clear that
1-I have to work with a wall adapter cause i have no experience in working with power supply so i want a solution with wall adapter(or a declaration tells me how to replace the wall adapter with power supply to work as i mentioned 24/7).
2- I want to use this shield with it's module ( GSM GPS shield for Arduino - Open Electronics - Open Electronics )it's working with input voltage between 7.5V and 12V.
but when i attach the shield with my uno it's get heated(but if i use the uno with the same volt and ampere it's working in a normal heat)
The main problem (i couldn't understand ) why the manufacturer said that the input voltage to the arduino should be between 7.5V and 12V while the arduino regulator allow only 5v to get to the arduino which supply the shield.
3-I want to know the exact name of the regulator used in uno.(and does it have internal protection or in some cases my uno may be damaged and damages the shield).
I want to say thanks again for everyone here.