O2 Network missed calls?

[Exporting2024]

I work in a small business and we have around 17 connections.

These connections are all over Scotland but for the most part around the central belt. Glasgow/Edinburgh.

My employee's have experienced "missed calls" from customers. when I say missed calls there is no notification on the handset. And from the customer/suppliers point of view they simple cant get through. No ringing no voicemail nothing.

Its not prolific but its enough to be annoying. I have had around 9 instances that my staff are aware off this year. 

Any suggestions. Different phone numbers, different locations. Some calls are international some are local.

[Oxonian]

@Exporting2024 

I think that to start with, you need to review :-

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

It is also worth looking at :-

My Network App - Find Out More About Your Network Coverage | Apps | O2

https://www.o2.co.uk/apps/my-network

Please post again if you require further assistance. 👍