- What is a SIM card?
- What are the different SIM sizes?
- Which SIM card does my phone need?
- Where is the SIM card slot located?
- How can I change my SIM card?
- Asda mobile SIM only deals
These little cards hold important information about your smartphone, such as its number and network provider. The unique identification number on every SIM card is used to associate your number, minutes, and other account details.
Regardless of what phone you have, everyone needs a SIM card for it to function properly.
At the moment in the UK, each phone is compatible with one of three SIM card sizes: Standard, Micro and Nano.
Standard SIM card
The Standard SIM card is the biggest of the three, at 25mm x 15mm. It’s not as commonly used anymore, but is usually still the compatible choice for older phones or less high-tech models with bigger space inside for hardware.
Micro SIM card
The Micro SIM is a size smaller than the standard SIM, measuring 15mm x 12mm. It was first introduced in 2003 and became more known in its usage after being implemented into the iPhone 4. However, like the standard SIM, it’s becoming increasingly obsolete, as modern phones nowadays favour the tiny Nano SIM card.
Nano SIM card
The Nano SIM is the smallest (and most common) SIM card size at the moment, coming in at a tiny 12.3mm x 8.8mm. Launched in 2012, they’re also the newest SIM size available right now and are compatible with most recent smartphone releases. There’s hardly any plastic border around the chip, so it would be interesting to see how SIM cards could get any smaller than this.
Not for a phone: eSIM
Though not used on smartphones as of yet, there is a fourth SIM type that is compatible on smartwatches. Unlike the three above, it’s built into the device and can’t be removed. It allows the device to act like a stand in for a phone.
If you’re switching networks or have just purchased a new phone, you’ll need to swap your SIM out for a new one, but you might not know what type of card size you need. As we’ve said, many older phones tend to use a Micro SIM, but the majority of newer releases are so small that only a Nano SIM would fit. Here’s a quick breakdown of what some manufacturers and their models require.
- iPhone 12s: Nano SIM
- iPhone 11: Nano SIM
- iPhone Xs: Nano SIM
- iPhone 8s: Nano SIM
- iPhone 7s: Nano SIM
- iPhone 6s: Nano SIM
- iPhone SE (2016 & 2020): Nano SIM
- Galaxy S6 to Galaxy S21 series: Nano SIM
- Galaxy Note 7, 8, 9, and 10: Nano SIM
- Galaxy S6, 7, 8, and 9 series: Nano SIM
- Galaxy Note Edge: Micro SIM
- Galaxy A series: Nano SIM
- Galaxy J series (2016): Micro SIM
- Galaxy J series (2018): Nano SIM
- Honor P40 series: Nano SIM
- Honor P30 series: Nano SIM
- Honor P20 series: Nano SIM
- Honor P10 series: Nano SIM
- Honor P9 series: Nano SIM
- Honor P8: Nano SIM
- Honor P8 Lite: Micro SIM
- Honor Mate 9 series: Nano SIM
- Honor Y series (2017): Micro SIM
- All Pixel phones: Nano SIM
- Xiaomi Mi Note 10 series: Nano SIM
- Xiaomi Mi 10 series: Nano SIM
- Xiaomi Redmi 6, 7, 8, and 9 series: Nano SIM
- Xiaomi MIX series: Nano SIM
- Xiaomi Mi Note and Note Pro: Micro SIM or Standard SIM
- LG G6, G7, and G8 series: Nano SIM
- LG G5 series: Nano SIM
- LG G2, G3, and G4 series: Micro SIM
- LG V10 and V20: Nano SIM
- Nokia 7 Plus: Nano SIM
- Nokia 6: Nano SIM
- Nokia 5.1: Nano SIM
- Nokia 3.1: Nano SIM
- Nokia Lumia series: majority require Micro SIM (exempt: Lumia 1520, Lumia 735, Lumia 830, Lumia 930)
- Doro 8080: Nano SIM
- Doro 8050: Nano SIM
- Doro 7010: Micro SIM
- Doro 6040: Micro SIM
- Doro 5516: Micro SIM
- Doro 1360: Micro SIM
If your phone model isn’t on here, don’t worry. A quick internet search or browse through your mobile’s instruction manual will tell you what SIM card size you need.
If you order a SIM from us, we’ll send you all three sizes so you’re guaranteed to have the card you need.
If you’re changing SIM cards, you’ll have to remove your current one and place your new one inside. This means locating the SIM card slot and popping it open. Your card slot may be found in one of three places:
- Exterior on the side - sometimes you can only access your SIM card through the interior (see 2 and 3), but on many iPhones and Androids the slot is on the exterior. Turn your phone on its side and see if you can spot a little cover with a tiny pin-hole beside it. You can use the SIM ejector tool that will be supplied with your SIM cards to push the card tray open
- Under the back cover - if the back cover on your phone is removable, you may be able to find your SIM card slot underneath by simply lifting the back off
- Under the battery - if your battery is removable, the SIM card tray may be under this
Once you’ve located the SIM card slot, all you need to do is open it and take the old SIM card out. This SIM is now effectively useless for you if you’ve swapped networks, so you can either keep it somewhere safe or destroy it (as it still stores your personal information).
When you insert the new SIM card, there’s a 45-degree notch in one corner that will align with the tray, so you’ll know which way to insert it. Once inserted, simply close the tray and place the cover back on your phone (if that’s how it was accessed).
If you need help changing your SIM, watch our video guide:
Discover more about SIM only
If you’re not sure whether SIM only is right for you, check out our blogs on all the advantages and benefits you can reap from this type of phone plan: