Have the china mobile shop in Xiamen airport and nearby XM University?

If I arrive at XM airport ,I want to buy cellphone sim card and I want to use internet on my cellphone , So do you know If I buy cellphone sim card , can I immediately use the internet on cellphone ? So, do you know the china mobile shop in the airport and nearby XM university??

And one more guestion
Have the ICBC bank in the airport and nearby XM university?

Thanks you