Fixing to check if your phone is network-locked
| Step |
Action |
What It Fixes |
| 1 | Check your network status | Confirms if issue is network-wide |
| 2 | Toggle aeroplane mode on/off | Re-registers SIM on your network |
| 3 | Restart your phone | Clears temporary network errors |
| 4 | Check your network APN settings | Fixes incorrect data configuration |
| 5 | Re-insert SIM card | Fixes poor SIM contact issues |
| 6 | Contact your network support | Resolves account or SIM faults |
A PUK is the 8-digit code needed to unlock a SIM after three failed PIN attempts. Getting the PUK wrong ten times permanently destroys the SIM.
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⚠ Do NOT guess the PUK — 10 wrong attempts permanently destroy the SIM
Unlike the PIN (3 attempts), you get 10 PUK attempts total across all time. Entering the wrong PUK 10 times permanently destroys the SIM card — it cannot be unblocked and a replacement must be ordered. Only enter the PUK once you have confirmed the correct code from your online account, SIM packaging, or network customer service.
Getting an unlock code from your network (IMEI Unlock Check Guide)
Several options exist for finding a PUK code without calling support:
1. Network account online: log in through the UK APN Hub and look under SIM or account details for the PUK.
2. The provider's app: account or SIM settings within it typically reveal the PUK in SIM details.
3. Dig out the original SIM card: the PUK is usually printed on the credit-card-sized holder itself.
4. Last resort — call support: the network will give the PUK once identity is confirmed; find the number on the UK APN Hub.
📶
SIM safety checklist
Rely only on the PUK shown in the account or on the packaging; guessing wrong repeatedly can be permanent
Step 1Do not guessStep 2Find PUKStep 3Unlock SIMStep 4Set new PINStep 5Test service
Unlocking your phone from your network online (IMEI Unlock Check Guide)
If the phone shows SIM card locked — enter PUK code, enter the 8-digit PUK, pick a new 4-digit PIN, confirm twice, and the SIM reconnects instantly.
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SIM safety checklist
The correct PUK is in the account or on original packaging — don't guess, since repeated wrong tries lock it forever
Step 1Do not guessStep 2Find PUKStep 3Unlock SIMStep 4Set new PINStep 5Test service
What to do after your network provides unlock code (IMEI Unlock Check Guide)
Via Settings → Security → SIM Card Lock, the PIN can be turned off entirely or changed to something simpler — less secure, but avoids accidental lockouts.
Entering the wrong PUK code (IMEI Unlock Check Guide)
The limit is ten PUK attempts before the SIM is unrecoverable. A free replacement SIM then carries over the number and account automatically.
📶
SIM safety checklist
Take the PUK only from the account or original SIM packaging; guessing repeatedly can permanently block it
Step 1Do not guessStep 2Find PUKStep 3Unlock SIMStep 4Set new PINStep 5Test service
!
⚠ Do NOT guess the PUK — 10 wrong attempts permanently destroy the SIM
Unlike the PIN (3 attempts), you get 10 PUK attempts total across all time. Entering the wrong PUK 10 times permanently destroys the SIM card — it cannot be unblocked and a replacement must be ordered. Only enter the PUK once you have confirmed the correct code from your online account, SIM packaging, or network customer service.
Frequently Asked Questions About IMEI Unlock Check Guide
How do I contact your network UK support?
You can contact your network UK customer support through their official website, via live chat, by phone, or through their social media channels.
How do I check my your network signal strength?
Check your phone's signal bars in the status bar. For a detailed reading, go to Settings → About Phone → Status (Android) or dial *3001#12345#* (iPhone) to open Field Test mode.
What should I do if your network has no service?
If your network shows no service, try toggling Aeroplane Mode on and off, restarting your phone, and checking your network coverage map for your area. If the issue persists, contact your network support.
How do I keep my number when switching to your network?
To keep your number when switching to your network, request a PAC code from your current provider by texting 'PAC' to 65075. You can then give this code to your network when you set up your new account.
Does your network support WiFi calling?
Many your network plans support WiFi calling. Check your network account settings or your network website to see if WiFi calling is available on your plan and how to enable it.