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SMARTY MMS Settings UK 2026 MMS
SMARTY MMS settings control how your phone sends and receives picture messages. The MMSC address is http://mms.um.three.co.uk:10021/mmsc and MMS Proxy is mms.three.co.uk on port 8799. Most Android devices need these values entered manually; iPhones receive them via the carrier bundle automatically.
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As an MVNO on Three's network, SMARTY uses the same MMSC and proxy values as Three and its other MVNOs like iD Mobile and spusu, with only the APN name differing.
SMARTY MMS Settings (SMARTY MMS Settings UK 2026 MMS)
Get these values exactly right in the APN profile; even a small typo prevents MMS from working.
| Field | Value | |
|---|---|---|
| APN | smarty | |
| MMSC | http://mms.um.three.co.uk:10021/mmsc | |
| MMS Proxy | mms.three.co.uk | |
| MMS Port | 8799 | |
| MCC | 234 | |
| MNC | 20 | |
| APN Type | default,supl,mms | |
| APN Protocol | IPv4/IPv6 |
⚠ MMS requires an active mobile data connection. Picture messages cannot be sent over Wi-Fi only — mobile data must be enabled.
Android MMS Setup — SMARTY
MMS is configured via the APN (Access Point Names) section in Android's mobile network settings, though the exact route varies by manufacturer.
Samsung (Galaxy devices)
- Open Settings › Connections › Mobile Networks › Access Point Names.
- Tap your existing SMARTY APN to edit it, or tap + to create a new one.
- Set APN: smarty.
- Enter MMSC: http://mms.um.three.co.uk:10021/mmsc.
- Enter MMS Proxy: mms.three.co.uk and MMS Port: 8799.
- Set APN Type: default,supl,mms.
- Tap ⋮ › Save, then select the profile by tapping the radio button next to it.
- To apply the changes, either restart the phone or toggle Aeroplane Mode.
Pixel and other Android devices
- Open Settings › Network & internet › Mobile network › Access point names.
- Tap the + icon to add a new APN, or tap your existing SMARTY APN to edit it.
- The table's values need entering exactly, with unlisted fields left empty.
- Tap the three-dot menu and select Save. Tap the radio button next to the APN to activate it.
- MMS settings take effect after restarting the phone.
⚠ Important: After tapping Save on Android, the APN is not yet active. You must tap the radio button (empty circle) next to the APN to activate it. The circle must be filled for the profile to be in use.
SMARTY MMS on iPhone
iPhones receive MMS settings automatically via the SMARTY carrier bundle. You generally do not need to enter them manually. If picture messages are not working on iPhone, follow these steps:
- Look under Settings › General › About for a carrier settings update prompt, tapping Update if one appears.
- Go to Settings › Messages and confirm MMS Messaging is toggled ON.
- Toggle Aeroplane Mode on for 15–30 seconds, then off, to re-register on the SMARTY network.
- Fully restarting the iPhone, then testing a picture message, is the last step.
- Should MMS keep failing, try Settings › General › Transfer or Reset iPhone › Reset › Reset Network Settings, which also clears saved Wi-Fi passwords.
Note: On iPhones with iOS 16 or later, the APN field at Settings › Mobile Data › Mobile Data Network may be greyed out. This is normal — SMARTY controls it via the carrier bundle. Contact SMARTY to force a carrier profile update if needed.
Common SMARTY MMS Problems
| Problem | Most Likely Cause | Fix |
|---|---|---|
| Picture messages stuck as "Sending" | Wrong MMS Proxy or Port | Verify MMS Proxy: mms.three.co.uk Port: 8799 |
| Can't send picture messages | Mobile data is off or MMSC is wrong | Enable mobile data; verify MMSC is exactly http://mms.um.three.co.uk:10021/mmsc |
| MMS works on Wi-Fi but not mobile data | Data connection issue or APN not activated | Select the APN profile using the radio button; restart phone |
| Receiving blank/broken MMS | APN Type missing mms value | Edit APN and set Type to default,supl,mms |
| iPhone not receiving group texts | MMS Messaging toggle is off | Settings › Messages › enable MMS Messaging |
Troubleshooting SMARTY MMS
- Confirm mobile data is switched on — Wi-Fi alone won't carry MMS traffic.
- Check the MMSC value exactly: http://mms.um.three.co.uk:10021/mmsc, character for character.
- Check the MMS Proxy and Port: mms.three.co.uk and 8799 — most stuck-message reports trace back to one of these being wrong.
- Make sure APN Type has mms as well as default and supl.
- On Android, the APN needs the radio button tapped to be active, not merely saved.
- Verify the messaging app has MMS switched on.
- A restart is needed after making any changes.
- Reset network settings last, then type every field back in.
- Call SMARTY on help if the problem continues.
Frequently Asked Questions — SMARTY MMS
What is the SMARTY MMSC address?
The SMARTY MMSC address is http://mms.um.three.co.uk:10021/mmsc.MMS Proxy: mms.three.co.uk, Port: 8799. Enter these values exactly in your APN settings to enable picture messaging.
Why are SMARTY picture messages not working?
The most common causes are: mobile data is disabled, the MMSC is entered incorrectly, or the APN Type does not include
mms. Verify the values from the table above exactly. Also confirm the APN profile is selected (filled radio button on Android).What APN type should I use for SMARTY MMS?
Use APN Type: default,supl,mms. This combines internet data, SUPL (GPS), and MMS in a single APN entry. All three values are required for full functionality.
Does SMARTY MMS work on 5G?
Yes. MMS works on all SMARTY network connections — 2G, 3G, 4G and 5G — using the same MMSC settings. The connection type does not affect MMS sending or receiving.
Why is MMS greyed out on my iPhone with SMARTY?
On iPhones, the MMS APN is controlled by the carrier bundle — you cannot edit it manually. Go to Settings › General › About to check for a carrier settings update. If MMS is still not working, contact SMARTY support: help.smarty.co.uk (online chat only — no phone support).