Three UK PAYG Trio SIM with £10 Credit + FREE £2 International Calls - (Retail Pack)

Fantastic choice! Simple install and activation instructions. Worked perfectly, giving me calls, texts and data in the USA

Very tricky to activate. Even though it has "3" printed on it, you must sign up with a website called Speakeasy, then you get an activation email branded as Love2surf (no mention of Speakeasy or 3). You then must make a phone call or send a text within the uk, before you can then activate foreign roaming. They then send you a welcome email, inviting you to download the My3 app (to monitor data usage, etc) - but impossible to sign in to My3 because 3 will only accept accounts with 07.. numbers, but Speakeasy numbers start 08... Eventually got it working, and data worked in uk. Then we flew to Singapore. Data worked ok here for 1 day, then we went to Malaysia, and it worked for 1 day. Then it stopped working. Every attempt to turn on data roaming brought up a dialog saying I had to log in to "three.co.uk", which was not possible. Tried everything as described in help, resetting network, removing / inserting SIM card, rebooting etc.. but data functionality was impossible. Finally bought a local SIM with 50Gb of roaming for $15 (£9 approx) which worked perfectly across Asia.

Worked perfectly in the USA. It was going to be £60 for a 2 week usage pass with 3, bought this sim for £8. Only issue is having a different number while using. Also noticed I needed to manually change mobile networks within the US, it would stop working based on network coverage, switching to another network solved that. I used it the day of travel in the UK to make sure it was all working. It took me a while in the US to work out I needed to select the correct network in mobile settings, once I did it worked great.

Purchased this sim for a trip to the US. Read a bunch of reviews and was concerned that I'd need to pay more than the cost of the sim. I've just arrived home and can happily report that there were ZERO EXTRA CHARGES! Got my sim card delivered the next day and simply followed the very clear instructions included. It worked perfectly and I had great coverage everywhere I went in the northeast of the US. I assume coverage is decent in the areas I was in and maybe if you're off to rock climb in the desert or hike in the middle of the forest it might be different. But I had a strong signal and fantastic connectivity the whole time. Just in case anyone is worried, here's the deal... Activate the sim BEFORE you leave the UK. Once you get your sim, you activate it via a very simple online form. The address for the website is included by a QR code and it's printed on the envelope you'll receive. You'll get a text from 3 and from the company who is activating for you. I was activated within a couple of hours. Once you're notified that the nunber is active you'll need to place one outgoing call that connects to a UK number. I called my husband's mobile. He never answers but it connected to his voicemail and that was enough. Do this while you're still in the UK! It's included in your package and is free. Then you're all set to go. This is a fantastic deal! Great value for money and I highly recommend.

Harder to set up, but once done it's good