There are many reasons why a computer may just stop working or "freeze". Most of the time there isn't much we can do about it, it is a fact of life that computer programs have become so complex that occasionally users will experience problems even when performing common tasks. When your computer no longer responds to keyboard commands your best bet is to re-boot the computer.
When you delete files and applications from the computer, all kinds of junk can get left behind. Useless files and data can accumulate and degrade system performance. Ironically, antivirus and anti-malware software, while vital to the health of a computer, can slow down a PC's performance. Low hard drive space or not enough RAM in the machine can also cause computer errors and slow down the machine.
This is the reason why it is important to approach a professional to unlock your phone so that you can use the cheapest and the best sim card in the device. We can unlock all makes and models of phone quickly and efficiently. This is also beneficial if you are visiting another country and want to use local sim card to avoid expensive roaming charges.