Which SIM can I use in my Huawei mobile hotspot device?

[AMS3]

I’ve got a mobile broadband device, can I buy a SIM only upgrade which is for a phone as it’s better value with more data, or do I have to get a data only SIM? Both are from O2. If I want to use the phone SIM, do I need to unlock the device first? Thanks in advance

[Cleoriff]

@AMS3 

You can use a phone sim in a dongle. I have a friend who swaps his from phone to dongle when he wants to use either device. EE actually provide sims which state they can be used in phone, tablet or dongle.

Are you sure your dongle is locked? If bought from anywhere other than a specific network, (such as Amazon or Argos) they are generally unlocked to any network.

Edited to add relevant links

https://kenstechtips.com/index.php/sim-cards-for-your-tablet-dongle-router-or-iot-device 

https://forum.vodafone.co.uk/t5/Mobile-Broadband/Can-I-use-a-pay-monthly-Phone-Sim-in-a-Dongle/td-p/... 

[MI5]

@AMS3 

O2 will only allow the long term use of specific mobile broadband Sims in their dongles. 

If you try to use a phone SIM for an extended period, it will be blocked.