This almost sounds too good to be true, but I've treble checked with 3 and it's 100% true!
3 have got a feature on their network that allows you transfer your call, text and data allowances from your existing 3 pay monthly contract or 3 pay as you go (PAYG) account for use abroad (inc USA). It's called Feel At Home.
I'm not on 3 at the moment, but here's what I'm going to do before I go to Vegas in June:-
1. Order a free PAYG Sim card from the 3 website -
https://www.three.co.uk/Support/Free_SIM/Order2. Buy an unlocked 3G or 4G phone from CEX or similar or buy the LG Optimus L1 II for £49.99 from 3 (3 have confirmed that this will work with their PAYG Sim card in the US and it's the cheapest option if you want a new phone rather than a 2nd hand one)
3. Create a My3account, link the SIM card to it and register a debit/credit card for topping up purposes
4. A few days before I go to Vegas, log into My3account and top it up on either the £10 or £15 All In One deal (see details of the 2 different deals here -
http://www.three.co.uk/Store/SIM/Pay_As_You_Go) - the £15 one is better as you would expect!
5. Put the SIM card in my unlocked phone and check that I can surf the internet on it using the SIM. If it doesn't work, some of the phone settings my need to be changed - see here
http://support.three.co.uk/SRVS/CGI-BIN/WEBISAPI.DLL?Command=New,Kb=Mobile,Ts=Mobile,T=Article,varset_cat=payasyougo,varset_subcat=4125,Case=obj(4091)
If I do all the above then I will be able to use this phone/SIM in Vegas and my usage will simply be deducted from the minutes, texts and data allowance I get on the All In One deal I've selected. I'll be going for the £15 deal as it gives you All you can eat data, 3000 texts and 300 minutes. The £15 top up lasts for 30 days, so if you're in Vegas for longer (lucky you!) after the first 30 days has expired, you can simply go onto the internet, log onto your My3account and top up using the card you've already registered to get another 30 days.
Once you come home and the 30 days expires, you are under no obligation to use the Sim card again. You don't need to keep topping it up. You can of course keep it for your next visit to Vegas or other foreign country! There's a list here...USA, Italy, the Republic of Ireland, Austria, Australia, Sweden, Denmark, Sri Lanka, Hong Kong, Indonesia, Macau.
There are a couple of drawbacks:-
1. You will have a different number when you're abroad, so you'll need to give your temporary number to your contacts.
2. You need to assume you are in the UK when using your phone in the US, so in terms of making outgoing calls, if you're ringing a UK number (including a UK mobile phone that's either in the UK or the US at the time) then it's included in the 300 minutes allowance on the £15 All In One deal.
If you are calling a US number, it IS NOT included and would be charged at £1.40 per minute.You can also get a PAYG Sim for use in an ipad or tablet etc! There's a bit more info in the comments at the foot of this page...
http://blog.three.co.uk/2013/12/04/feel-at-home-now-includes-the-us-of-a/Below is the chat I had earlier with 3 about this!
06:01:54 PM [Visitor] I'm interested in the Pay As You Go - All in One deals, but I need to know a few things
06:02:23 PM [Mohsin] We appreciate your business and would love to have you as a customer.
06:03:24 PM [Visitor] If I order a PAYG All in One £10 SIM card today, it's asking me to pay £10, so when does the 30 days become active?
06:03:37 PM [Visitor] Today or whenever I insert the SIM into a phone?
06:04:01 PM [Mohsin] I'll help you with your query in regards to getting the pay as you go sim today as well as the start date.
06:04:11 PM [Mohsin] While I help you with your query, may I please know your home postcode to check for coverage and to update the same in our system?
06:04:30 PM [Visitor] I already know I have coverage
06:04:43 PM [Mohsin] That's great.
06:04:47 PM [Visitor] I just have a few questions to help me decide if I want to go ahead
06:05:13 PM [Mohsin] Your 30 days start on the day you receive the package.
06:05:33 PM [Visitor] Is the PAYG All In One a contract? Am I tied in beyond the first 30 days?
06:06:34 PM [Mohsin] It's not on contract as it's a pay as you go deal.
06:06:56 PM [Visitor] Can I activate Feel At Home on the All in One PAYG, as long as the SIM has been active for 30 days first?
06:07:07 PM [Mohsin] After 30 days you need to top-up and convert that into add-on in order to get the above allowance.
06:08:26 PM [Mohsin] Yes you can use the sim in our feel like home country right away and you don't have to wait for 30 days.
06:08:51 PM [Visitor] I don't have to wait 30 days? I'm sure it says on your website that I do
06:10:03 PM [Mohsin] That is only applicable to our pay monthly sim only deals and not pay as you go.
06:10:17 PM [Visitor] right ok thanks
06:10:36 PM [Mohsin] Do you want me to summarize the deal for you?
06:11:06 PM [Visitor] So isn't the All In One a SIM plan?
06:11:15 PM [Visitor] Your website says this....
06:11:17 PM [Visitor] Is Feel At Home available to all Three customers?
Yes – you just need international roaming to be activated in order to pick up a signal when you go abroad. International roaming is activated automatically for all customers.
If you’re a new SIM Plan customer, you need to have been with us for 30 days before you can use your SIM abroad. After 30 days, roaming will automatically be switched on.
06:12:05 PM [Mohsin] Yes that's for a pay monthly sim contract.
06:12:36 PM [Visitor] right ok
06:12:40 PM [Mohsin] You are going with a pay as you go sim where there is no contract.
06:13:53 PM [Mohsin] Our Sim card will only work in any of your unlocked 3G or 4G compatible phone so which phone you'll be using?
06:14:13 PM [Visitor] I'm going to buy a 2nd hand unlocked phone
06:14:35 PM [Mohsin] That's great.
06:14:55 PM [Visitor] What's the cheapest compatible phone you sell that would work in USA with an All In One SIM?
06:15:14 PM [Mohsin] Sure let me check, give me couple of minutes.
06:15:42 PM [Visitor] I need to be able to use the Internet on it
06:15:59 PM [Visitor] so it needs a browser
06:16:44 PM [Mohsin] I can offer you Samsung Galaxy Fame for £64.99 + choose your £10 or £15 add-on in the Basket.
06:17:00 PM [Mohsin] The Galaxy Fame is a new mid-range phone from Samsung which offers a full smartphone experience at an affordable price. The Galaxy Fame is compact and stylish with a 3.5 inch touchscreen display, 3GB of internal storage and a fast 1.0 GHz processor to provide seemless browsing, gaming and downloading.
06:18:26 PM [Visitor] OK that's a little bit more than I wanted to pay. I will have a look at 2nd hand ones.
06:18:45 PM [Mohsin] I have one more option for you.
06:18:49 PM [Visitor] ok
06:19:44 PM [Mohsin] I can offer you LG Optimus L1 II for £49.99 + choose your £10 or £15 add-on in the Basket.
06:19:57 PM [Mohsin] The Optimus L1 II is easy-to-use and offers an excellent touch experience on its 3" capacitive touchscreen in addition, you get a 2MP camera with voice activated capture, long battery life and a powerful 1GHz processor which provides all the multitasking power you need to make the most of your phone.
06:20:17 PM [Visitor] OK thanks, I will think about it.
06:20:39 PM [Visitor] Can I order a free SIM online today and then go online and upgrade to the All In One later
06:20:40 PM [Visitor] ?
06:21:04 PM [Mohsin] Sure I'll help you with the link for a free sim.
06:21:19 PM [Visitor] Thanks
06:22:04 PM [Mohsin] Click on the link
https://www.three.co.uk/Support/Free_SIM/Order06:22:12 PM [Visitor] So once I've upgraded the SIM to All In One and paid my first £10/£15, do I need to do anything to get International Roaming to work and to activate Feel At Home?
06:22:58 PM [Mohsin] You don't have to do anything as you can use international roaming right away.
06:23:03 PM [Mohsin] Sounds good?
06:23:26 PM [Visitor] Yes that's great. Sounds almost too good to be true!
06:23:54 PM [Mohsin] Wonderful, that's the benefit of having a pay as you go sim.