Currently Being ModeratedMay 14, 2013 12:19 AM (in response to PhoneGuy66)
No, because in the first place, to be able to use a 4G network, you do actually need a 4G phone to be able to do so and the iPhone 4s is NOT a 4G phone.
The iPhone 5 is a 4G phone, but if it was purchased in an EU country, then you would not be able to use it on a US 4G network because of network incompatibilities. If you had an iPhone 5, then the best you could hope for would be a 3G signal.
As you don't have an iPhone 5, but rather an iPhone 4s, then the answer is obviously no.
Currently Being ModeratedMay 14, 2013 4:46 AM (in response to PhoneGuy66)
It all depends on the roaming agreement your provider has here in the USA.
At&t is the leading 4G provider.
T-mobile is the second but I cannot confirm whether or not there is 4G in Washington.
Also, the iPhone 4S shows the 4G logo on the HSPA+ networks here. Even though it's not true 4G, it's still fast!
I think Ethmoid is talking about LTE.
Just a warning, 3G in America is generally really slow when compared to Europe. I can get 5-10mbps in Austria/Italy/UK, but 3mbps is the max I have ever gotten anywhere on At&t.