PAYG SIM in intruder alarm no longer sends picture MMS

[GordonMcM]

I have a PAYG SIM in an intruder alarm system, which when originally setup, sent picture messages when activated.  However it no longer does so, ordinary text messages do still operate by sending and receiving texts, allowing me to activate and deactivate the device.

There is plenty of credit on the SIM, so that shouldn't be the issue.  When given the command to send a picture, the alarm sends me a text stating that a MMS image is being sent, but none arrives.

I would like to identify where the issue is, with the SIM MMS service via O2 or with the alarm.  Can anyone advise how to proceed with resolving the problem.

Thanks

Gordon

[Bambino]

@GordonMcM Only way at the moment is to speak to customer service, which is difficult.

https://community.o2.co.uk/t5/Other-Products-and-Services/Coronavirus-Covid-19-Community-Help-and-Su...

Guide: Coronavirus Community Help and Support 

[MI5]

@GordonMcM 

Lots of complaints of MMS not working currently so assume it's a network issue.