Three Unlimited 5G Data SIM Card - No Contract or Credit Check - Rolling 30-Day £25/Month Subscription

Very good value for money, I’m using this sim with a 5g router and i’m getting 700+mbps downloaded speed (Obviously mostly due to good service). The sim has a Fair Usage Policy of 1Tb which is good enough for me. It is truly plug in and play. Highly recommend.

This is worth every £ I paid for it. I will definitely buy another one. I've never suffered any glitch or loss of signal.

I purchased this SIM originally on 3 July 2025, and was blown away with the performance. I went from an ageing 50Mbps BT broadband connection to a blazing fast 300 – 400Mbps full 5G connection (50 – 75% signal). It WAS brilliant! I even replaced my landline with a SIP provider for phone service. Games would download in minutes instead of hours, it was absolutely awesome. However, I went away for 6 days to visit family and when I came back the router was no longer finding ANY 5G signal at all, and now stuck on 4G only. The speed also dropped, down to 1Mbps on a bad day, to 50Mbps on a good day. Signal is now highly variable. Contacted support, and was fobbed off with essentially “Everything appears OK on our end”. End of support ticket. So, I paid £188 for 2.5 year fixed connection, that once was full 5G. It worked OK for a bit, and now on some days I can’t even use SIP for phone calls because the network is so unreliable there is insufficient bandwidth. So far, choosing this provider has been the BIGGEST mistake ever. I am now hoping and praying that at some point in time one of two things happen: 1. They go and MAINTAIN / CHECK their equipment. 2. A 5G mast is installed somewhere near my postcode. Until then I am stuck on a unreliable, patchy, and very slow internet connection. If the phone rings, I have to pause any other devices on the network in case the phone drops out. At this point, BT would be better, but I can’t stand them. I even tried installing a 5G antenna, the signal improved, but still no 5G. My advice to EVERYONE: Buy a 1 month only SIM first to check signal. NEVER buy more than 6 months, just in case you end up in my position now. Money down the drain. Now I have to save up and find a different network SIM and try again.

Prompt delivery, instant activation. £190 for until 08 October 2028 is a great value for money. The data limit of 1000 GB a month limit is no problem for me, I use around 450 GB a month. I set my router to do the data usage count and auto reset every month. Although I have no line-of-site to a Three base station, the signal is reasonably good and I still can get around 100 Mbps downlink and 20 Mbps uplink.

Activated within 5 minutes, working perfectly within my Three mobile broadband router. Speeds over 600 Mbps most of the time. Only shame is that I can't check my usage, but the price is so reasonable it's worth it. Opportunities The advertised "unlimited" storage is actually limited to 1 TB. Additionally, a significant discount was found a few weeks later during a promotional period, which is disappointing.

I was getting tired of my broadband supplier locking me into a contract with built-in price rises, so I took a chance on buying a 5G router and this unlimited data sim. It was one of the best purchases I've ever made. I'm now getting upwards of 300 meg speed in the day, and 500 meg (sometimes) late at night, when the phone network is obviously less well used. That matches and exceeds my previous 250 meg broadband speed, which is a fibre line to the house. Fantastic. And if I go on holiday anywhere (UK only), or move house, I can take my super-fast broadband with me. As I've never been on the Three network before, I did check online to see if I was in a good area for Three, and it was fine. If you're still unsure, try a one-month sim to make sure it's a good network for you. But always come back to this company for your long-term deal - they do sims for all the other networks too. The cost per month is incredibly low, and I'm the kind of person who likes to pay once, up front, so now I don't have to pay again until July 2027. No internet bills for 19 months! Customer support was excellent. I needed the 'mature content block' removed, and that happened in less than 24 hours. There are more blocked sites than you think, not just the obvious ones, so you may need that. It's very easily removed, you just ask. Unlimited actually means 1000 GB of data, after which your connection is slowed until the month rolls over again. For me that's not a problem. The router is telling me how much I've used and I probably won't even break 500 GB this month. And that's with me watching a huge amount of internet TV, and doing a lot of downloads and uploads. Not a lot of 4K TV in that though, so if you have a big household and everyone wants to watch lots of 4K movies all day every day you might reach the 'limit'. Even then, the company contacted me and offered a 'truly unlimited' deal, but I didn't need it to pay the extra for that. One small niggle was that my IP address kept changing, sometimes every minute, and that made my banking site constantly log me out, and there were problems staying logged into my web-based email too. Looking online I found that you can change the default APN to '3internet' and that will give you an IP address which stays fixed for longer. My problems disappeared as soon as I did that. You'll need to check online how to do that with your router - mine is a Cudy 5G router, also bought from Amazon. From what I've seen this seems to be specific to the Three network. APN = 3internet, leave the username and password blank, and set 'Authentication type' to PAP. I bought this sim to test it until my fibre contract runs out, and it's so good that I've switched off my old box altogether, and use this sim card for 100% of my internet now, with 3 computers, a TV, tablet, and mobile phone wifi all connected to the same router, powered by this Three sim. Highly recommended.

Excellent signal for use on a mobile WiFi. Works in a Vodafone mifi/phone. Very please with the signal

Very poor. I've previously had an EE SIM which has worked great. This gave extremely poor speeds (even though the THREE map shows good service in my area). It also doesn't seem to switch to Vodafone at all, even though it says it does! I tried to send this back to Amazon as I'd literally had it in my router for 1 hour and they were extremely unhelpful and refused my return. It's by far the worst customer care I've had from Amazon. Extremely disappointed. I feel that, as the SIM card is basically unusable, distance selling regulations should mean that I can return this within 14 days, but Amazon say no! Beware - DO NOT BUY unless you're absolutely sure!