So much wrong information here.
I own 1 of these 24gb three 4g Sims

Facts:
* It comes with a number, and can receive calls/texts
* It cannot make calls/texts until you top it up.
* If you top up to make calls then the data no longer lasts 24 months, it expires after a month, it's a DATA sim. If topped up with a plan that includes data, ALL data left on sim is lost and replaced with new data bought.
* It does work abroad. I've always found THREE to be throttled when using it abroad.
* Of course they work in a phone. Ridiculous comment above saying tablet/mifi/dongle only. Mines is currently in a Samsung S5.

It lasts for 24 months from the time you activate it, and when thats up, or you've used your 24gb, just buy another one, cheaper than topping up.

You didn't get an A* in GCSE maths did you?

does this work in a normal mobile phone

Best would be if you had double sim phone, just stick this and another with minutes in or payg if you are light user, contract free.

Got one of these, with a cheap phone so my son can play Pokémon Go. Excellent value for money.

hi, does this last for 24 months or do you have to use it within 30 days once you've registered it, seems too good to be true, amazon it says "Pre-loaded with 24 GB of data which is valid for up to 24 months topped up and ready to go
Connects your 3G or 4G tablet to the internet wherever you are
Once you've used up your preloaded data, top-up and Pay As You Go or maximise your top-up with value add-ons for use within 30 days; use your add-on's data allowance to get online abroad at no extra cost in 42 destinations worldwide
You can top-up online with or without registering a card Just have your card details or voucher ready, along with the SIM number you'd like to top-up
My3 allows you to manage your account and save your card details, redeem a voucher, buy Add-ons and keep an eye on your spending"
thanks

thanks for your reply, ordered one

definate heat no expiry date either.pays to buy a few

A review dated 7/1 suggest it dropped to £25. "This is fantastic value. Two years of connectivity for £25. That's unbeatable."

Must have been for a very brief period because it did not register on camelcamel.

I've ordered one for delivery next week using free nominated day delivery just in case price drops again. If it does, I just reorder and cancel order @ higher price.