If your TAG Mobile SIM shows signal bars but your internet won’t load, MMS won’t send, or hotspot refuses to work, the fix is often simple: add the correct APN profile and make it active. TAG Mobile’s official setup lists these core values: Name: TAG Mobile and APN: ereseller, plus MMS details like MMSC: http://mmsc.mobile.att.net and MMS Proxy: proxy.mobile.att.net, with APN Type: default,supl,mms and APN Protocol: IPv4/IPv6. In this guide, you’ll set up those TAG Mobile APN settings cleanly, avoid common mistakes that break MMS, and use quick resets that bring data back without stress.
What “APN” means and why it matters on TAG Mobile
APN stands for Access Point Name. Think of it as the small set of rules your phone uses to reach your carrier’s data network. When the APN is missing or wrong, your phone can look “connected” but still act offline—apps time out, picture messages fail, and hotspot can’t authenticate. That’s why an APN fix can feel like flipping the lights back on in a room that looked fine but wasn’t wired correctly.
With TAG Mobile, you usually don’t need to touch APN settings if everything auto-loads. The moment you swap phones, reset network settings, or use a device that didn’t fully pull carrier settings, you may need to add the APN manually. TAG Mobile even notes this scenario directly—when you remove your TAG Mobile SIM and switch to another phone model, you may need to set the APN to restore the connection.
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When you should update TAG Mobile APN settings
Most people land here for one of these everyday problems.
Your phone shows LTE/5G (or 4G), but webpages won’t open. You can call and text, yet maps and social apps refuse to refresh.
MMS fails. Text messages send, but photos and group messages get stuck.
Hotspot turns on, but your laptop says “No internet,” or the connection drops instantly.
Everything worked yesterday, then a reboot, update, or SIM move changed something.
When these happen, creating a fresh APN profile (instead of editing the default one) often gives the cleanest result because it avoids hidden carrier entries that your phone protects in the background.
The official TAG Mobile APN values you should enter
TAG Mobile’s APN setup page provides a full set of fields. The most important ones are the APN name, APN value, and the MMS fields. Below is the same information, laid out in a tidy way so you can copy it without hunting through menus.
| Field | Value |
|---|---|
| Name | TAG Mobile |
| APN | ereseller |
| MMSC | http://mmsc.mobile.att.net |
| MMS Proxy | proxy.mobile.att.net |
| MMS Port | 80 |
| MCC | 310 |
| MNC | 280 |
| Authentication Type | None |
| APN Type | default,supl,mms |
| APN Protocol | IPv4/IPv6 |
| Bearer | Unspecified |
If your phone shows extra fields like Proxy, Port, Username, Password, or Server, TAG Mobile lists those as Not Set, which usually means you should leave them blank.
A small detail that matters: APN Type must be typed exactly, including commas. A stray space can cause MMS routing issues on some devices, because the phone reads the APN type tags very literally.
How to add TAG Mobile APN settings on Android
Android menus vary a little by brand, but the flow is usually the same. TAG Mobile’s guide points you toward the Mobile Networks area where APNs live.
Start in Settings. Look for Network & Internet (Pixel) or Connections (Samsung). Then open Mobile network (or SIMs, if you see dual-SIM options). From there, tap Access Point Names.
Now, instead of changing whatever is already there, add a new one. Tap the + icon or Add (sometimes it’s inside the three-dot menu). TAG Mobile specifically recommends adding a new APN and then entering the values.
Enter the fields from the table above. Save it using the three-dot menu or the Save button. Then go back to the APN list and select the new “TAG Mobile” profile so it becomes active.
Finally, give your phone a quick network “refresh.” TAG Mobile suggests toggling Airplane Mode on and off after saving and selecting the APN. This small step often forces the device to re-register data settings and start a fresh connection.
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How to set TAG Mobile APN settings on iPhone
iPhone is a little different because Apple sometimes locks APN editing depending on the carrier bundle. Apple’s guidance is clear: don’t change APN settings unless your carrier tells you to, because incorrect values can break cellular data.
If your carrier allows APN editing, you can usually find it here:
Go to Settings → Cellular (or Mobile Data) → Cellular Data Network (or Mobile Data Network).
If you see the fields, carefully enter the TAG Mobile values in the relevant sections (Cellular Data and MMS). Save and test.
If you do not see “Cellular Data Network,” or the fields are missing, your iPhone is likely using a carrier profile that doesn’t allow manual edits. In that case, the most reliable move is to reset the network configuration so the iPhone requests fresh carrier settings.
Apple notes a built-in reset option in the APN screen (when present): Reset Settings can revert back to the carrier defaults. If your issue started right after switching SIMs or transferring from another carrier, this reset can remove old routing behavior that’s still hanging around.
After that, restart your iPhone and test data and MMS again.
The “clean” checklist before you assume the APN is wrong
APN fixes are powerful, but you’ll save time if you do a quick sanity check first.
Make sure Cellular Data is turned on and you’re not accidentally in Low Data Mode.
Restart the phone once. It sounds basic, but it clears stuck radio sessions.
Toggle Airplane Mode for 10 seconds. TAG Mobile recommends this after APN changes, and it’s also a good first test when data feels frozen.
If you’re on iPhone, check whether a carrier settings update is pending. Even without manual APN edits, carrier bundles can affect data behavior.
If these don’t help, move on to the manual APN setup with confidence.
Troubleshooting after you add TAG Mobile APN settings
Sometimes the APN is correct, but one small detail prevents it from working. Here’s how to spot the most common patterns.
Data still doesn’t work
Go back to the APN list and confirm the new profile is actually selected. On many Android phones, the APN can save properly but remain inactive until you tap the radio button.
Also confirm the APN field is spelled exactly: ereseller. One extra character can block authentication.
MMS still won’t send
MMS is usually the first thing to fail when the MMSC or proxy is missing. Recheck these fields:
MMSC: http://mmsc.mobile.att.net
MMS Proxy: proxy.mobile.att.net
MMS Port: 80
Then look at APN Type. Some devices treat default,supl,mms as a strict set of tags. Avoid spaces around commas because certain phones misread “default, mms” as an invalid tag.
Hotspot doesn’t work
Hotspot can fail when the phone connects to data, but tethering rules don’t route correctly. First, confirm the APN Protocol is set to IPv4/IPv6 as TAG Mobile lists.
If your phone offers a “Bearer” setting, leaving it “Unspecified” is usually safer than forcing LTE, because forcing a bearer can reduce compatibility in areas where the network changes bands. TAG Mobile lists Bearer as Unspecified.
Then restart the phone and test hotspot again.
Everything works, but speed feels capped
APN settings won’t magically increase coverage or tower capacity. If your area is congested, you can see slow speeds even with perfect settings. The APN mainly ensures your phone is taking the correct path to data and MMS.
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A practical “good habits” setup so you don’t fight APNs again
Once you get TAG Mobile APN settings working, keep it stable.
Avoid deleting the APN profile that works. If you like a clean phone, it’s tempting to remove “duplicates,” but that working profile is your safety net.
If you switch phones again, take a screenshot of the APN table above before you move the SIM. It saves you from guessing later.
When something breaks after an update, don’t immediately edit random fields. Start by confirming the profile is selected, then toggle Airplane Mode, then restart. This keeps your setup tidy and reduces trial-and-error.
And if your device is managed by an organization or uses configuration profiles, remember that profiles can override APNs. Apple notes that APN settings can be controlled by a configuration profile in some environments, and resets may revert to what the profile defines.
Safety note: verify when your phone or SIM is unusual
Most TAG Mobile customers will be fine using the official values above. Still, it’s worth saying plainly: carriers and MVNOs can update backend routing, and certain SIM batches or partner networks can behave differently. Apple also warns that editing APNs incorrectly can break data and potentially create unexpected charges in some cases, so follow carrier instructions when possible.
If the settings above don’t work after careful entry and a restart, the best next step is to check TAG Mobile’s Help Center and APN page again, because that’s where updates would appear first.
The simple takeaway
TAG Mobile APN settings are not complicated, but they must be exact. Create a new APN, enter APN: ereseller, add the MMS details, set APN Type: default,supl,mms, save it, select it, and toggle Airplane Mode once. For iPhone, use the Cellular Data Network screen if it’s available, and if it isn’t, rely on resets so the phone pulls the carrier defaults cleanly.
