SMARTY APN Settings
Quick Answer
The SMARTY APN is mob.asm.net, with the username and password left blank. Note that the profile is named 3 and the MMS servers are three.co.uk addresses — SMARTY runs on Three, so those values are correct despite not mentioning SMARTY at all.
SMARTY publishes the most complete APN documentation of any UK virtual network, down to the MCC, MNC and MVNO matching values. Everything below comes from SMARTY’s own help centre. You should not normally need any of it — SMARTY says settings update automatically when you join — but it is here for the cases where they do not.
Complete SMARTY APN Settings
| Name | 3 |
| APN | mob.asm.net |
| Username | Leave blank |
| Password | Leave blank |
| Proxy | Not set |
| Port | Not set |
| Server | Not set |
| MMSC | http://mms.um.three.co.uk:10021/mmsc |
| MMS proxy | mms.three.co.uk |
| MMS port | 8799 |
| MMS max message size | 307200 |
| MCC | 234 |
| MNC | 20 |
| Authentication type | Not set |
| APN type | Not set (blank) — see the note below |
| APN protocol | IPv4 |
| APN roaming protocol | IPv4 |
| MVNO type | GID |
| MVNO value | 0309 |
| Bearer | Not published by the operator |
The APN Type Contradiction
SMARTY’s help centre gives two different answers for APN type. The main APN article says to leave the field blank, and repeats that as “Not Set” in its Pixel, Nokia and Sony sections. Two of its roaming articles instead say internet+mms, and those pages carry more recent dates.
Both are SMARTY’s own instructions, so there is no resolving this from outside. In practice: leave it blank first, since that is what the dedicated APN article says. If data works but picture messaging does not, set it to internet+mms — that is precisely the failure the second value would fix.
Entering SMARTY APN Settings on Android
- Open Settings and go to Network & internet (on Samsung, Connections).
- Tap SIMs or Mobile networks, then Access Point Names.
- Add a new APN and enter mob.asm.net in the APN field.
- Save from the three-dot menu, then select the new profile so its radio button is active.
SMARTY’s guidance is to change the APN field only: “That’s the only thing you have to change. If there’s any information in other fields, you can leave it as it is.” That is worth following — filling in every field from a table is a common way to break a profile that would otherwise have worked. Our Android APN guide has the per-manufacturer menu paths.
Entering SMARTY APN Settings on iPhone
On iOS the values go in Settings > Mobile Data > Mobile Data Network, with mob.asm.net under both Mobile Data and MMS, and the MMS proxy entered as mms.three.co.uk:8799. SMARTY notes that on iOS 26 and later the settings update themselves, so you should not need to touch them at all. See our iPhone APN guide if the Mobile Data Network option is missing.
If SMARTY Data Still Will Not Work
Restart the handset after saving, or toggle aeroplane mode, since a new profile rarely takes effect until the radio re-registers. Check the APN is spelt mob.asm.net exactly — it is easily mistyped as mob.asm.net.uk or mob.smarty.net, neither of which exists. Confirm the new profile is the selected one rather than merely saved. If the profile is right and data is still dead, the cause is usually not the APN at all; our mobile data not working guide covers the rest.
SMARTY, Three and VodafoneThree
SMARTY states plainly that Three provides its network. Since August 2025, following the June 2025 merger that created VodafoneThree, SMARTY customers automatically use both Three’s and Vodafone’s radio networks at no extra cost. Both SMARTY and VodafoneThree confirm this needs no settings change, so if your coverage has shifted recently that is the explanation — not a reason to start editing APNs. For the host network’s own values, see Three APN settings.
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Get a Mobile Quote →Frequently Asked Questions
What is the APN for SMARTY?
The SMARTY APN is mob.asm.net. Leave the username and password blank. It catches people out because it contains neither “smarty” nor “three” — if you are hunting for an APN with the brand name in it, you will not find one. SMARTY also names the profile itself 3 rather than SMARTY.
Why is the SMARTY APN profile called "3"?
Because SMARTY runs on Three’s network, and the settings it publishes are Three’s. The MMS addresses are three.co.uk hostnames for the same reason. This is correct even though it looks wrong, and it is the most common reason people assume they have been given the wrong values.
What APN type should I use for SMARTY?
SMARTY’s own documentation disagrees with itself here. Its main APN article says to leave APN type blank, while two of its roaming articles say internet+mms. Start with blank, as the dedicated APN article specifies; if picture messaging then fails, try internet+mms. Both instructions come from SMARTY’s own help centre, so neither is a third-party guess.
Do I need to change my APN when using SMARTY abroad?
No. SMARTY states there is no separate roaming APN and no need to change anything back when you return to the UK. The same mob.asm.net profile applies at home and abroad.
Has the Vodafone and Three merger changed SMARTY APN settings?
No. Since August 2025 SMARTY customers use both Three’s and Vodafone’s radio networks, but that is radio-level sharing and both SMARTY and VodafoneThree state no settings change is needed. If your coverage has changed recently, that is why — and it is not a reason to edit your APN.
What are the SMARTY MMS settings?
Use the same APN, mob.asm.net, with MMSC http://mms.um.three.co.uk:10021/mmsc, MMS proxy mms.three.co.uk and MMS port 8799. Leave the MMS username and password blank. On iPhone the proxy and port go in together as mms.three.co.uk:8799.
