# SIM7020E doesn't register to network

**URL:** <https://forum.core-electronics.com.au/t/sim7020e-doesnt-register-to-network/12388>\
**Category:** Support\
**Created:** [6 December 2021 09:40 UTC](https://forum.core-electronics.com.au/t/sim7020e-doesnt-register-to-network/12388 "2021-12-06T09:40:19Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Oliver33](https://avatars.discourse-cdn.com/v4/letter/o/a9adbd/32.png) [@Oliver33](https://forum.core-electronics.com.au/u/Oliver33)\
**Post date:** [7 December 2021 22:37 UTC](https://forum.core-electronics.com.au/t/sim7020e-doesnt-register-to-network/12388/3 "2021-12-07T22:37:39Z")

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Some networks only allow approved devices. SIMCOM have a lot of approvals with Telstra, so it might be worth getting a $2 telstra sim just to test with (you don’t need to load it up, I did the same thing):

> [@Sim7000e can't Connect to the any network](https://forum.core-electronics.com.au/t/sim7000e-cant-connect-to-the-any-network/9810/13):
>
> Update - I bought myself a $2 pre-paid Telstra SIM - I’m connected! [image] I didn’t bother paying for any credit, so I can only receive, but I CAN receive! smiley I’m connected via CAT-M1 smiley PS: a fantastic plain English tutorial: [https://www.developershome.com/sms/howToUseHyperTerminal.asp](https://www.developershome.com/sms/howToUseHyperTerminal.asp) Understanding AT commands is hard - @Tim should write a tutorial stuck_out_tongue_winking_eye

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