No but I get the jist of the conversation. I suppose the funny is tied to the language usage of the British language as you say. Something you will only find funny if you have full understanding of british slang. Bloody good mate!
You don't need a full understanding of British slang.
Let me Americanize the tweets in the image for you: @O2 this **** is a bitch mayne I swear dawg point me to your owner, what happened to my internet connection yo i be having to use my home's wifi and **** @Tunde24_7 Have you tried to reset the router thing homie? so that you can use your home's wifi and ****?
I guess o2 initially misunderstood: he's forced to use his home's WiFi because his own cellular internet is not working, and he's annoyed.