Fake caller ID
If you want to do market research, you can use fake caller ID device to change and hide your phone number. This device will help you to change your phone number in order to do market research. Market research needs you to ask certain same seller to identify their price strategy and other information about the products. You can change your voice, so that they will not be able to identify your voice properly. This is not cheating, because this device is very helpful especially for some occasion. Market research is the best value of achievement, but if you are not a marketer, you can also get price from several company to compare their price.
Fake caller ID from spoof phone number is the best device, you can use it for you iPhone and blackberry. This feature does not allow you to use it as criminal action or illegal activity, because you will be identified by some security institution. This device is only legal purpose such as call someone you like, call your ex boyfriend or girlfriend and call your family.
If you visit spoofphonenumber.com you will be able to try three free callers to test the system. This will ensure you the quality of the device, but sure, you are welcome to buy some.