# Mangoh yellow usim problem!

**URL:** https://forum.legato.io/t/mangoh-yellow-usim-problem/4895
**Category:** Uncategorized
**Created:** [December 7, 2019, 1:14pm UTC](https://forum.legato.io/t/mangoh-yellow-usim-problem/4895 "2019-12-07T13:14:10Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![SeongBeom27](https://avatars.discourse-cdn.com/v4/letter/s/76d3ee/32.png) [@SeongBeom27](https://forum.legato.io/u/SeongBeom27)
#### Post date: [December 7, 2019, 1:14pm UTC](https://forum.legato.io/t/mangoh-yellow-usim-problem/4895/1 "2019-12-07T13:14:10Z")

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Hello, I have a one problem!!

I know there’s a USIM inside mango Yellow.  
By the way, I want to use another USIM. So there is a problem trying.  
Even if I put usim in the slot, mangoh yellow couldn’t recognize my usim. It only recognizes internal usim.

How can I use my usim for mangoh yellow?

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### Author: ![lotam](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@lotam](https://forum.legato.io/u/lotam)
#### Post date: [December 9, 2019, 2:38am UTC](https://forum.legato.io/t/mangoh-yellow-usim-problem/4895/2 "2019-12-09T02:38:28Z")

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Maybe you have to select the SIM slot accordingly, please try:

- AT cmd: AT!UIMS=(x)

- Legato API  
[SIM - Legato Docs](https://docs.legato.io/latest/c_sim.html#le_sim_SelectCard)

- Legato “cm” tool  
[cm - Legato Docs](https://docs.legato.io/latest/toolsTarget_cm.html#toolsTarget_cm_sim)

> ```
> cm sim info
> cm sim select EXTERNAL_SLOT_1
> (or EXTERNAL_SLOT_2)
> 
> ```

For info, I don’t have MangOH Yellow to check, but hope that may help…

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<div class="post-metadata">

### Author: ![SeongBeom27](https://avatars.discourse-cdn.com/v4/letter/s/76d3ee/32.png) [@SeongBeom27](https://forum.legato.io/u/SeongBeom27)
#### Post date: [December 9, 2019, 11:03am UTC](https://forum.legato.io/t/mangoh-yellow-usim-problem/4895/3 "2019-12-09T11:03:45Z")

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thanks!! i’ll try you advice!