Locked phone is one in which the SIM card used in the phone is in locked condition. You cannot use the phone and you cannot replace the SIM card with another one. This is a common problem with the CDMA phones. The GSM phones on the other hand are available in unlocked condition and you can use in it a SIM card from any service provider.
Your apple iPhone can get locked if you tend to purchase it in one country and use it in another. This is the common problem which the individuals using Apple iPhone face. To unlock your iPhone you need software. To unlock it you need software of the right kind so that it remains functional.
If you don't have the technical knowledge then the best option for you is to search for the software designed for this purpose.
Many companies offer this service for fees. They promise to unlock your iPhone in return for a fee. The fees may vary from one company to another. Some may charge up to $100 to unlock your iPhone while others may charge less. They vary in this respect and therefore you have to be careful with the price that you pay to get your iPhone unlocked. Avoid the offers which promise you to unlock your iPhone at very low prices.
Some companies offer to give you the software which could unlock your iPhone. Such services are generally available online. You can pay them online and download the software. This option seems much more convenient than to shop around in the market for the store with reasonable price that can turn your iPhone alive.
With online option you can browse the net, search the companies, and compare their prices, use your credit card to pay them online and then finally download the software for your iPhone. But before you purchase and download the software ensure that the software is a genuine one and not a spyware or virus. Avoid the free software for this purpose. These are generally the malwares that make the iPhone non functional.
A virus will not unlock your iPhone or it will make your iPhone dysfunctional. On the other hand a spyware will track everything which you do with your iPhone. So, be careful when you download. To avoid such malwares, search for trusted sites. Download the software for the authentic and recommended sites created for this purpose. This will also ensure you that the software that you download can be updated in near future.
Your small gadget is an expensive device. So, be careful with the software that you choose to unlock your iPhone.