Every cell phone, GSM modem or other device with a built-in phone / modem has a unique 15 digit IMEI (International Mobile Equipment Identity) number. This number can be used to check important information about a device, for example the manufacturer and model number.

The method used to locate an IMEI number varies depending on the device to be checked. Below you can find links to locate the IMEI number of many common devices.

Follow the links below:

Once you have located the IMEI number of your mobile phone, simply enter this number into the IMEI checker above. The information obtained can be used for a variety of reason, for example to correctly identify a mobile phone for insurance purposes or, more typically, in order to remotely unlock a phone so it can be used on another cellular network.


Mobile companies say their phones are already heavily subsidised to entice you to buy them, and they need to make up this shortfall. Yet the reality, as ever, comes down to cold hard cash. For the firms, it wouldn’t make sense to sell you the phone at reduced cost, and then let you take your cash to another network provider.

However, it’s not all doom and gloom and some providers, such as Three, have started selling unlocked phones – both to those on pay-as-you-go and pay-monthly contracts.


It’s a common misconception that unlocking your phone is illegal. Unsurprisingly, mobile phone companies aren’t keen to dispel this myth. The confusion arises because unlocking and unblocking are often mixed up. They mean different things. In a nutshell:

  • Unlocking is totally legal. It just means making the phone work with any Sim card.
  • Unblocking is illegal. This is the practice of making a phone work again after it’s been blocked by the networks, usually as a result of its being reported lost or stolen. It’s thoroughly illegal and should not be attempted.


When you sign-up to a new mobile phone contract, typically you’ll get a phone as part of the deal. Chances are this phone will be locked to the network you got it from – and if you try to put another network’s SIM card in it, it simply won’t work. But by unlocking it you can use it with any compatible SIM card, on any network. Doing so has several benefits:

  • You can bag a cheaper tariff. If you’re happy with your phone handset, but don’t have a good deal, unlocking it allows you to keep the phone but switch to a cheap Sim-only deal on another network.
  • You can grab promo deals. Often networks give away free Sim cards, which can come with free texts or calls. Yet if your phone isn’t unlocked, you can’t put them in and take advantage.
  • Added handset value. Unlocked phones tend to sell for more on websites such as eBay, because they have much wider appeal to users on other networks and in other countries.
  • Freedom to roam. Unlocking means you can use foreign Sim cards to cut phone costs while you’re abroad.

In short, unlocking gives your mobile independence from the network you got it from – and it’s usually simple to do. Many older handsets can be unlocked using codes generated free on the web, and if that doesn’t work, you can do it for a reasonable fee, either through your network, or on-line phone unlockers.

Even if you have to pay to unlock the handset, unless you’re on a particularly good tariff already, the savings should quickly outweigh the outlay.


Before trying to unlock your phone, make sure it’s necessary.

To check if you REALLY need to unlock your phone, try inserting another network’s Sim – if it’s locked, it should say on the screen.

This applies to most modern handsets – if yours is too old to work with this method, then see unlocking an older phone with a code or unlocking via a cable.

Step 1. Out of contract? It should be free, otherwise check your network’s policy and apply

As of early October 2016, Government intervention means…

Networks are no longer allowed to charge unlocking fees to pay monthly customers who are out of contract.

However, if you’re still within the minimum term of your contract, or if you bought your phone on pay-as-you-go, there may still be a charge.

If you bought your phone second-hand, it might be slightly trickier to unlock. Some networks will still do it for you, whereas others, such as Vodafone, may require that the unlock request is made by the (former) account holder. If this isn’t possible, consider a third-party unlocker.

Important note: If your network can’t quote you a price for an unlock code, then it may mean your phone isn’t unlockable by code. If that’s the case, don’t bother looking trying to buy a code elsewhere – they may charge you just to tell you it isn’t possible. Go straight to unlocking via a cable instead.

Step 2. Once approved, finalise the unlock

Once your network has confirmed that your phone unlock has been processed, you may or may not need to enter a code to finalise it.

This depends on your handset and you should receive specific instructions from the network, but generally speaking with iPhones you’ll just need to follow the on-screen instructions for setting up the new Sim once you’ve inserted it (which may involve connecting it to iTunes).

Is your iPhone jailbroken? In order for the official unlock to work, you must remove the jailbreak and all associated applications from your iPhone first. If you don’t, you won’t be able to unlock it through this means.

Step 3. If the network won’t do it, try the dedicated unlockers

It’s unlikely you’ll be able to find a third-party retailer to unlock your phone for less than what the network will do it for (though there’s no harm in checking), but if it won’t because you’ve got a second-hand phone or you’re not yet far enough through your contract, then it’s worth looking elsewhere.

The web’s probably not the best place to look due to the amount of dodgy operators promising quick fixes. Check specialists on the high street – they might be cheaper.

The added advantage of these is that if they can’t do the job you won’t be charged (always check though), whereas on the web you may pay regardless.

If you’re looking online, be sure you know exactly what you’re getting before you pay. Read the terms and conditions to make sure they won’t fob you off with something other than the code you need. Also, always check the site’s legitimacy, as sadly there are some unscrupulous firms out there.

Do note, while some are much quicker and can send the code in fifteen minutes, some report it can take several weeks for your code to come through, depending on the network. Once it arrives, follow the instructions in method 1 to put it into the handset.


Several sites simply list codes for a range of older phones without charge. Many people believe the practice of locking phones is anti-competitive, and so there’s a lot of info to help consumers fight back against it. If you’ve a newer phone, it’s likely there won’t be a free code available – yet there’s still no harm in checking before you move on to paid options.

This method works best for older phones. Giffgaff’s useful Unlockapedia notes that while this method works for many old Nokias, LGs, Panasonic and Siemens phones, it’s unlikely to work for most others. It’s still worth quickly trying to see if you can find a code for your phone just in case, though after trying that, go to Method 3.

Step 1. Get your facts right

To find a working unlocking code for your handset, you need three pieces of info: its brand/model number, the network, and the IMEI code. Here’s how to find them.

  • Brand and model number
    The chances are you already know this, as it’s likely to be written on the handset, its box, and any documentation you got when you bought it, so we’ll move on.
  • The network
    This is simply the network the phone’s currently locked to, not the one you want to get on.
  • The IMEI
    The International Mobile Equipment Identity is a unique number given to all mobile phones, which gets marked as invalid when phones are reported lost or stolen. To find your IMEI, simply type *#06# into your handset, and note down the number that appears.

Step 2. Find an unlocking code

There are a raft of websites dedicated to phone unlocking. Which you should use depends on your handset brand.

  • Nokia phones
    The easiest way to unlock older Nokias is via codes found on sites like Unlock NokiaFree.
  • Other brands
    Try Giffgaff’s handy Unlockapedia – just pop in your handset type to get more info. You’ll find a full discussion of other phones in the Unlocking non-Nokia phones discussion in the Mobile Phone Forum. If you can’t unlock your phone with a free code, go to Method 3.

Step 3. Use it!

The sites above will generate a code based on the info you provided, so double-check it’s right first. The code will look something like this. #pw+2746763089+1# (Nokia phones), or *2767*637# (other makes).

To unlock the handset, take the Sim card out of the phone and put in a different network’s Sim. Now you can put the code in.


This can be fiddly – for some phones, rather than using the regular text keys you need to use the * key if you want to produce letters as opposed to numbers. For example, to produce a ‘p’, press the * button three times within two seconds; to produce a ‘w’, press the * button four times within two seconds; to produce a ‘+’, press the * button twice within two seconds.

You should now get a message saying ‘phone restriction off’ (or words to that effect). You generally only have five attempts to enter the correct code so be extremely careful. If none are successful, the phone will still work, but you’ll have to go to the network or a retailer to get it unlocked instead.

A smaller number of older handsets: try with a cable

If all else fails, your phone may only be unlockable by using a cable attachment. You can either pay to have it unlocked this way, or, if you’ve a keen head for technology, do it yourself.

Use a high street or market unlocking service

Since you’re going to have to post your phone to any online unlocking service for them to be able to unlock it via cable (a process which can in itself be costly and cause headaches) the local unlockers have the upper hand.

It’s worth asking for a few quotes and playing the sellers against each other. With these sorts of services, you may be surprised at how far a bit of haggling can go.

Or, do it yourself

If you fancy yourself as a tech-nerd, you can also buy a cable on eBay or via cheap accessory websites, and download free software which should do the trick.
An important warning: this can get complicated, so be sure to research it thoroughly online before parting with cash for the unlocking ‘clip’. Be very careful, as this method is only for the technologically experienced who can work through all issues.

There are different clips for each brand, and often for different handsets within that brand, so make sure you get the right one for your needs. If you only want to unlock one handset, then the most economical option may be to buy the clip, unlock the phone, and then re-sell it on eBay to recoup your costs.

Now it’s unlocked, go & save cash!

Now your handset’s unlocked, the mobile world’s your oyster! Read the Cheap Mobiles guide for info on getting a good deal, and Cheap Mobile Roaming for top deals on calling from abroad.

If you’ve tried everything above to no avail and you’re left with a handset you don’t want and can’t unlock, why not recycle it to earn some cash? For help, see the Sell Old Mobiles guide to find the top payer for your phone.