No 3G or 4G signal in busy areas

[Mazcross]

I have an Iphone 13 Max Pro on an unlimited tariff.  Whenever I am in a city centre with a lot of people or at a concert or gig with large numbers of people I have no service either 3G or 4G so I can't get in touch with anyone by text, voice or Whatsapp.  It's very frustrating to paying so much money for a phone and contract which doesn't even work if its a bit busy!  I've already reset the carrier settings.

The rest of the family are on O2 and have service when I don't.

[Mazcross]

*Sorry should have said Iphone 12

[MI5 · Accepted solution]

@Mazcross 

I'd start with a new sim.

Pop into your local O2 store for a free sim swap.

[RafaC]

Hey @Mazcross did you manage to solve this issue already?

[Mazcross]

I'm going to pop into an O2 shop to get a new sim

[anticpated]

Many things can cause a slow down in allotted bandwidth. The more congested your local cell tower is, the least chance you have of achieving the speeds of your contract.

I find at times it is where you are not the network per se. The fallback to a lesser band and reduced speed at least keeps your connection alive.

I get 3g and h+ in some parts of my flat and outside mostly 4g for the best part