30 Day Rolling SIM Only deals

What is a 30-day SIM card?

A 30-day SIM card is exactly what it sounds – one with an allowance of minutes, texts and data that lasts 30 days, after which it will usually automatically renew, but you’re free to cancel.

What’s the advantage of a 30-day SIM?

The advantage of a 30-day SIM card is that it’s more flexible than a typical contract, as you’re only committed for 30 days. After every 30 days you’re free to change your tariff or cancel if you want.

Are there any disadvantages to a 30-day SIM card?

Generally, a 30-day SIM Only deal will cost more than a 12-month one. So if you’re sure you’re going to be happy with a specific network and set of allowances it can make more sense to commit to 12 months.

Which networks offer 30-day SIMs?

The following networks all offer 30-day SIM cards:  Three, O2, Vodafone,  Smarty Mobile, Lebara, VOXI, and iD Mobile.

Do I have to stick with my current network?

No, as long as you’re not currently tied in to a contract you’re free to choose any network. Give your current network a call to check if you’re not sure.

Which network should I choose?

There are a number of things to consider when choosing a network, but the most significant ones are 4G and 5G coverage, whether you can tether, and where you’re allowed to roam abroad for free. Read on for a breakdown of all these things.

Coverage

All UK networks have comprehensive 3G and 4G coverage, while 5G coverage is rapidly improving. The chart below gives a breakdown of each network’s 4G coverage, but for 5G, the situation is changing so rapidly that your best bet is to use a network’s coverage checker to see if it’s available where you need it.

Tethering

Tethering refers to the ability to use your smartphone’s data and signal to get another device online, essentially using your phone as a portable Wi-Fi hotspot. The chart below details which networks allow this. At the time of writing, all of the networks on this site allow tethering.

Roaming

All of the networks on this site let you use your data, minutes and text allowances across the EU at no extra cost at the time of writing – this is true even now the UK has left the EU.

If you want to roam further your best options are Three, which allows you to roam in 71 international destinations, many of which are beyond Europe, Vodafone, which on ‘Unlimited Max’ plans lets you roam in 81 destinations, or O2, which on select plans allows free roaming in 75 places.

Can I get a 30-day SIM with unlimited data?

Yes, you can get this with Three, O2, Vodafone, VOXI, Smarty Mobile, iD Mobile and Lebara.

How do I keep my number?

Just order your 30-day SIM deal and then text 'PAC' (from your old number) to 65075, or alternatively call your current network, tell them you’re leaving and ask for your PAC code.

Pass this code on to the network you’re joining and your number will be ported, usually within the next working day. Just make sure you don’t delay too long in handing the code over, as they expire after 30 days.

What SIM card size do I need?

SIM cards come in three sizes. The only type used in modern smartphones is a nano SIM, but some phones - particularly those which are much older - will use a larger micro SIM. Then there’s the larger still standard SIM, but these are generally only used by very old handsets.

If you’re not sure what size SIM card your phone uses you can look online or contact the manufacturer. However, this shouldn’t stop you ordering a 30-day SIM, as most networks now provide a trio, multi or combi SIM, which has all three sizes in one, so you can just pop out the size that’s right for your phone.

Will I lose service if switching network?

You will if you’re porting your number, but only for a very short amount of time.

Can I switch from a Pay Monthly phone contract to a 30-day SIM Only contract?

Yes, as long as you’re not tied in to a contract with your current network. If you’re sure you’re not then simply order your 30-day SIM card, then call your network to say you’re leaving – and while you’re on, ask for your PAC code, as you’ll need this to port your number.