Hi

[Chloeb31]

When I’m on the phone I’m losing signal and can’t hear anyone

[Enlli]

See if anything in these guides helps

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

https://www.o2.co.uk/connectivity/wifi-and-4g-calling

[japitts]

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@Chloeb31 wrote:

When I’m on the phone I’m losing signal and can’t hear anyone

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If you lose coverage, then calls will drop. Are you reporting a loss of in-call audio?

[Oxonian]

This is worth looking at @Chloeb31 :-

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

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