Addicts

There is an increasing number of people who can't live without their mobile phones, tablets or laptops. Even when a group of friends get together in a bar for example, they totally ignore each other and concentrate on their gadgets instead. If these people spend some time without their gadgets, they experience the same symptoms as those of a drug abuser's: nervousness, cold sweats and increased heartbeat. To try to face this, some digital detox centres have been set up in some countries. There is one in the United States, which is situated in the forest. There the patients leave their gadgets in a cabin and for some days they do many activities that have nothing to do with new technologies, such as cooking and writing workshops(using typewriters). In Spain two hotel chains offer a service, which includes leaving the guest's phone locked in reception for a week. Ninety per cent of the guests manage to spend the whole week without it, but the remaining ten per cent end up asking the receptionist for their mobiles before that time.

Well written, before you mentioned Spain, I was going to say ''only in America'' 

Wonderful job!  Just a few things to make it even better:

Addicts

There is an increasing number of people who can't live without their mobile phones, tablets or laptops. Even when a group of friends get together at a bar, for example, they totally ignore each other and concentrate on their gadgets instead. If these people spend time without their gadgets, they experience the same symptoms as those of a drug abuser's: nervousness, cold sweat and tachycard [uncommon word] rapid heart rate. To try to face this, some digital detoxification [or detox] centres have been set up in some countries. There is one in the United States, which is situated in the forest. There the patients leave their gadgets in a cabin for some days and they do many activities that have nothing to do with new technologies, such as cooking and writing workshops (using typewriters). In Spain two hotel chains offer a service, which includes leaving the guest's phone locked in reception for a week. Ninety per cent of the guests manage to spend the whole week without it, but the remaining ten per cent end up asking the receptionist for their mobiles before that time.