4g not working

[Charrrr30]

Got the iPhone 7 plus on my upgrade, 4g did not work spoke to customer service they sent me a new one which still doesn't work, not good enough. What do I do? 

[Gemma]

@Charrrr30 - So that we can check it’s active on your account, please get in touch with us via Live Chat.

If 4G is already set up on there, please follow the steps from our network troubleshooting guide. This will help us to identify why it’s not working.