# How do I set the cellular APN and MTU?

**URL:** <https://forum.rabbitcommunity.tech/t/how-do-i-set-the-cellular-apn-and-mtu/15455>\
**Category:** issues & bugs\
**Created:** [September 9, 2025, 3:10am UTC](https://forum.rabbitcommunity.tech/t/how-do-i-set-the-cellular-apn-and-mtu/15455 "2025-09-09T03:10:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Humancell](https://sea2.discourse-cdn.com/flex002/user_avatar/forum.rabbitcommunity.tech/humancell/32/6293_2.png) [@Humancell](https://forum.rabbitcommunity.tech/u/Humancell)\
**Post date:** [September 9, 2025, 3:10am UTC](https://forum.rabbitcommunity.tech/t/how-do-i-set-the-cellular-apn-and-mtu/15455/1 "2025-09-09T03:10:54Z")

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I just inserted my SIM card into the Rabbit, but cannot find where/how to set the critical parameters - APN and MTU size. You did provide a Data Roaming switch.

I work for KORE Wireless and we sell a Global Roaming SIM (Super SIM) that allows me to take the Rabbit to ~190 countries and use ~400 different carrier networks, but it requires the use of our custom APN - “super” - and our MTU size needs to be 1360 bytes or less.

I can’t where/how to make these settings.

Here in the USA the SIM provides access to all three primary carriers - AT&T, T-Mobile, and Verizon. On T-Mobile they honor the Diameter response list of APNs and my Rabbit works on T-Mobile, but on AT&T and Verizon the APN must be configured.

Thoughts?

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**Author:** ![mattdomko](https://avatars.discourse-cdn.com/v4/letter/m/9f8e36/32.png) [@mattdomko](https://forum.rabbitcommunity.tech/u/mattdomko)\
**Post date:** [September 10, 2025, 12:20pm UTC](https://forum.rabbitcommunity.tech/t/how-do-i-set-the-cellular-apn-and-mtu/15455/2 "2025-09-10T12:20:27Z")

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It’s not user configurable, but we do have a rather large dataset of APNs pre-configured thanks to the folks at CipherOS.

If you drop the config here, we can try to get it added into the next OTA.

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<div class="post-metadata">

**Author:** ![Humancell](https://sea2.discourse-cdn.com/flex002/user_avatar/forum.rabbitcommunity.tech/humancell/32/6293_2.png) [@Humancell](https://forum.rabbitcommunity.tech/u/Humancell)\
**Post date:** [September 10, 2025, 4:31pm UTC](https://forum.rabbitcommunity.tech/t/how-do-i-set-the-cellular-apn-and-mtu/15455/3 "2025-09-10T16:31:38Z")

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Hello,

That makes sense. Do you know the format of the entries for the SIMs?

In this case, it is a roaming multi-IMSI SIM and we usually lever the MCC/MNC/SPN to uniquely identify the appropriate APN. This is how it is done in Android.

If this is the case, then the values are:

| MCC | MNC | MVNO Type | MVNO Value | APN |
| --- | --- | --- | --- | --- |
| 232 | 10 | SPN | Twilio | super |
| 234 | 10 | SPN | Twilio | super |
| 234 | 50 | SPN | Twilio | super |
| 732 | 123 | SPN | Twilio | super |
| 232 | 10 | SPN | KORE Super SIM | super |
| 234 | 10 | SPN | KORE Super SIM | super |
| 234 | 50 | SPN | KORE Super SIM | super |
| 732 | 123 | SPN | KORE Super SIM | super |

The duplication of the entires is caused by a change of the SPN value when the Twilio business unit was purchased by KORE Wireless.

Let me know if there are further questions!

Thank you! I’ll keep testing!