iPhone 4s White 16Gb Brand New SEALED ?

Brand new Apple iPhone 16 Gb in white. Still Sealed in box. I have been told that a new iPhone locks to the 1st network you use it on. However I have just heard this and am not sure if it works. So I am selling this as on Vodafone ONLY. Reasonable offers will be considered. I aim to respond to all messages within 30 mins