Three Mobile PAYG Voice SIM Pack - 30GB - £15

Perfect for travelling. Bought for going to the US as didn't want to pay for an extortionate bolt on or overseas charges. I have a dual sim so was easy to swap. No issues at all using in US and was perfect amount of data.

Worked perfectly

- Bought the sim card a few days before my trip to the US. Inserted it into my phone to activate it. Got the text messages with the number and everything, even downloaded the app.- Data seemed to work within the UK. However, zero balance was showing on my account (after registering the number, of course).- Contacted customer support, which confirmed that if my data is working in the UK, even though the balance is zero, it should work in Go Roam countries like the US (where I was planning to go and the reason for this purchase).- Went to the US. Data wasn't working (even though it is a Go Roam destination). Kept receiving notifications from AT&T or Verizon about how there is no data available and they can help me top up.- No data throughout the whole trip. Customer support informed that should I need data, I would need to top up. My explanation was that, since this is a pre-loaded SIM card and whatnot, I shouldn't have to buy more.- 6 days after contacting customer support again while in the US and sending them proof of this purchase, all I got was the following in an email:"Thank you for contacting us and sending us the proof as requested.We have attached the proof on the account."Needless to say, I still had no data for the remainder of my trip.It was my fault that I didn't heed the warnings of some other reviews on this page. I rarely leave reviews on products, but this time I felt that people need a heads-up should they decide to purchase this and essentially test their luck. I believe you would be better off purchasing a SIM from a different carrier that, even though it may be more expensive, would give you the peace of mind you deserve.

Love taking these SIM cards abroad as it allows for the use of internet without having to buy a local SIM, just be sure to activate it in the UK before you fly and keep it in your phone, otherwise you will lose internet connectivity! Found out the hard way when I placed it into a travel router and realised my mistake.Even when purchasing the 10GB pack, roaming will still give you the 12GB limit so the data allowance is very generous, provided you are not abroad for very long or are not consuming heavy amounts of data via streaming etc.At around 8-10 quid per SIM (depending if you buy it on a deal) these are a nice cheap alternative to roaming abroad or even some local SIMs in some countries, the fact it works in 71 countries is great as it would cover most popular holiday destinations for most people! Only downside is, you will not be able to make local calls in said countries if you need that functionality. But you can call & text UK numbers no problem.

I was very concerned about my family running up a huge phone bill on a recent trip to New York so we removed our UK sim cards and used these instead. These sims allowed for worry-free calls and texts on the trip although a message occasionally popped up saying there were insufficient funds on the card to make the call. The same message then did not appear on other occasions. WhatsApp using the sim card's data became the most reliable way of keeping in touch during the trip rather than the mobile service itself if that's make sense. Used Google maps constantly to get around the city and only used a fraction of the data.

The Three Mobile PAYG Voice SIM Pack is excellent! With 10GB for just £10, it's fantastic value for money. The setup was quick and easy, and the network coverage is reliable. I'm very pleased with the performance and affordability. Highly recommend for anyone needing a budget-friendly mobile plan!

My mobile phone operator charges an arm and a leg to roam with data when abroad. I've bought these SIMs before, and went with these again for my latest trip. They connect straight away, give you a lot of data, and seem very reasonably priced. Calling UK numbers is included, but note that calling numbers in the foreign country where you are travelling is probably not included as these, bizarrely, are considered international calls despite you being right there. But I find these a real reassurance for those times when you are out and about and don't have free Wi-Fi within range. The signal quality is dependent on the local operator, of course, and I did have times in the mountains when my phone had no signal despite a phone of a local being able to connect, but this could just have been my phone or the particular network my phone had attempted to join. In most places it worked well, and the cost of data was around a pound per gigabyte, rather than my home (UK) operator's pound per megabyte.

Tested in San Francisco and Los Angeles. Works well and speeds are quite good too, 50-80MB download. All you have to do is insert it into your phone and enable roaming in the settings. These work in Ireland and UK too.Three offers two similar SIM cards on Amazon, I did not know which was better so I bought both. They are the same, speeds are the same. You don't have to register them, but if you want to find out how much data you have left, you have to. Registration process was not really straightforward for either. The 12GB was harder to register, I had to dig around in the Three's site but once registered the website for it is more updated.The only part I did not like about these SIM was that Hotspot functionality is disabled on them. You can't share your Internet with the others.