It is most rational thing to check all the specifications in order to choose the right kind of iPhone instead of believing what the advertisement or the salesman say about it. You will observe that most of the parameters are more or less according to the specification sheet supplied with it In case you find any Free Verizon iPhone 4 and check its parameter against its specification. With many other iPhones present in the market you may do the same and you will be indeed shocked they are very much out of specification. Under the worst condition only Free Verizon iPhone 4 can work while rest can work only in best condition.
You can yourself see that by measuring all the specifications. Therefore at any place with different kind of network if you use the iPhone of Verizon you will always get same performance, which you may or may not find with others who do not conform to their own specifications. Since as a promotional offer many websites are now providing Free Verizon iPhone 4 gift for this iPhone 4 at FreeVerizonIphone4.net and hence it will be foolish to overlook such offers as you will really miss a good quality of iPhone.