by mayerling » Mar 21, 2011 Fellow PSers, please help. FI has an iPhone4 which he recently purchased in the UK. Over here, you get your iPhone through a specific network and you can ask your network to unlock it for you so that if you pop any SIM in (UK or from abroad), you can still use your iPhone. Now, FI is visiting the US soon for a couple of weeks and he'd like to get a US SIM so he can use his phone while he's over there. Are there any US networks that can give you a SIM (with data) to use with your iPhone? Thanks.