How to network unlock an Android phone in the UK, and how to tell whether it is locked at all

A network lock is something the seller put on the handset, not a fault, and on a UK phone bought in the last few years it is often not there at all. This page covers proving a phone is locked, what each network publishes about the code, and where the code goes on a Samsung. The blunt part: the sites charging to unlock a phone sell what EE, O2 and Vodafone each print as free, and no code revives a handset blocked by IMEI.

Followed a 2011 link about the Galaxy S II unlock app? That section says what the app did and why the route is gone. Otherwise start with proving the lock, then asking your own network and typing the code in. Our answer and the table ↓

Start here, because most UK phones are already free

The test costs nothing. Put a working SIM from another network in and make a call. giffgaff's help article, read 13 September 2026, reads the result plainly: If it gets a signal/network and you're able to use your services, that means your phone is unlocked. It names the trap too, Be sure not to use an O2 SIM as giffgaff uses the O2 network, since an O2 locked handset passes that test.

With no spare SIM, the same article describes Settings, then Connections or Network and internet, then Mobile network, then Choose network: If your phone shows several available networks it is unlocked. If you can only select one then it is locked to that one. The on-screen wording is never the word locked: O2's unlocking page, read 13 September 2026, lists 'incompatible SIM', 'enter subsidy PIN' or 'enter network unlock code' as the messages to expect.

New phones are the easy case. Ofcom's own announcement returned HTTP 403 to our fetch on 13 September 2026, so it is quoted here from the Internet Archive capture of 16 December 2025: Mobile phone companies will be banned from selling 'locked' handsets, and The new rules will come in from December 2021. Networks moved earlier in places. O2's page, read 13 September 2026, says almost all devices shipped after January 2019 are unlocked and names Alcatel and Doro as the exceptions, while EE's page, read the same day, says every Google Pixel, Oppo and OnePlus device is already unlocked whenever it was bought. Older and second-hand handsets are where a lock still turns up.

Free on every UK network page that opened

All of it needs the IMEI, the 15 digit number identifying that handset. Dial star, hash, zero, six, hash, written *#06#, and it appears on screen. O2 and Vodafone both give that instruction, read 13 September 2026.

EE. EE's unlock article, read 13 September 2026, points at an online tool: Now you can unlock your device free of charge no matter what. It states no waiting time.

O2. O2's page, read 13 September 2026, says you can ask at any time, for free, by calling 202 free from a Pay Monthly handset or 4445 on Pay As You Go, and only for a device bought directly from O2. The contract minimum term still runs whatever SIM is fitted, and on timing it says This can take up to 10 working days when the maker holds the code. Android owners get it by email.

Vodafone. Vodafone's SIM help page, read 13 September 2026, answers the cost question with Yes. Unlocking your Vodafone phone or SIM is free of charge. The route is the Network Unlock Code form, read the same day, which wants the IMEI, make and model, rules out a phone bought from another retailer, and refuses a handset reported lost or stolen. Neither page prints a waiting time.

Three. Three sits with Vodafone inside VodafoneThree, whose own site, read 13 September 2026, lists Vodafone UK, Three UK, SMARTY, Talkmobile and VOXI as brands while the customer sites stay separate. Three's unlocking article sits on its knowledge base host, and the request to that host on 13 September 2026 failed before any page was served, on a TLS certificate name mismatch, so no Three price or timescale appears here. Three's device support did open, and its guides are quoted below.

giffgaff. Usually nothing to unlock: the giffgaff article, read 13 September 2026, says Any phone you buy from us should be already unlocked, and sends an incoming handset back to its seller. Because giffgaff runs on O2, it says an O2 locked phone works on giffgaff with no unlock at all.

Samsung. The maker is not the place to ask. Samsung UK support, read 13 September 2026, is blunt: Samsung does not lock any of its devices to any particular network. You will need to contact the original service provider or retailer to request an unlock code.

Ten wrong tries and the phone is finished

Read the warning before touching the keypad. Three's guide for the HONOR X8 5G, read 13 September 2026 at Three device support, prints it above the steps: Your device will become permanently locked if you enter an incorrect code more than 10 times. It adds Your device will not show you the amount of attempts remaining. Copy the code out of the email rather than retyping it, and stop after one failure to check it matches the handset.

The Samsung sequence is short. Three's guide for the Galaxy S24, read the same day at the same device support site, has you hold the code ready, insert the other network's SIM, switch on, and then The device will display an empty text field and request the 'SIM network unlock PIN', where you enter the code and tap Done. A normal result is undramatic: The device will return to the standby screen and will show the new network.

If no prompt appears at start-up, Vodafone's NUC instructions, read 13 September 2026, list per model fallbacks, including older Galaxy handsets started with no SIM fitted, where #7465625*638* plus the unlocking code and a hash is typed into the dialler. Those sequences are model specific, so use the one printed against your model, not one from a forum.

History, and a route that no longer exists

This is for anyone who arrived from a UK news post of 24 May 2011. That post, recovered from an archive capture of 24 August 2011, reported an app called Galaxy S 2 Unlock, from members of the XDA Developers forum, which searched the handset for the code the network had left on it: The codes are found in the nv_data.bin file on your phone and the app will hunt them out. It carried one condition, It will only work if your phone has been rooted. That is history as reported in 2011, not advice for 2026.

Two things closed the route. Reading a protected partition needs root, and root now starts with unlocking the bootloader, which the Android Open Source Project documentation, read 13 September 2026, ties to a wipe: the device should perform a factory data reset to prevent unauthorized data access. Second, storage is encrypted by default, since the same documentation set, read that day, states All devices launching with Android 10 and higher are required to use file-based encryption.

The blunt part: there is no reason to try it. The code that app dug out of a file is the one EE, O2 and Vodafone hand over for nothing, on a phone that stays intact, and a handset wiped chasing the old trick is still locked afterwards. This page does not recommend the rooted route.

What to check before money changes hands

Judge any paid offer against the three network pages above, all read 13 September 2026, on which the same service costs nothing. A paid service also cannot do what the networks refuse: Vodafone's form, read that day, turns away a handset reported lost or stolen.

Locked and blocked are different faults and only one is fixable. A blocked handset has had its IMEI barred, which is why the giffgaff article, read 13 September 2026, lists SIM not accepted as the message shown when they've been barred as lost or stolen. No code touches that.

Before paying a stranger for a second-hand phone, get the IMEI and check it. CheckMEND, read 13 September 2026, sells a history report saying whether a device is recorded as stolen, lost, subject to an insurance claim or Blocked by a mobile network, and advertises Get your first check FREE! with paid checks after. Test the lock with your own SIM before money moves, and treat a seller who will not give you the IMEI as the answer.

What usually follows is here: setting the phone up and moving your data, and what an older handset is still safe to do once patches stop. If the phone is lost rather than locked, the find, lock or erase steps come first, in that order.

Checked 13 September 2026: first publication, written thin and to be deepened later. Every page named above was read on 13 September 2026 with a desktop browser user agent and redirects followed. Two fetches failed and are recorded rather than guessed at: Ofcom's announcement returned HTTP 403 and is quoted from the Internet Archive capture of 16 December 2025, and Three's knowledge base host failed a TLS certificate name check.