Why don't you remove the SIM card for a while and see what works and what doesn't? It's much quicker, simpler and safe than asking.
You would think it would be a quick, simple process to pull out a SIM card, but unfortunately my phone sucks. It's an LG and I bought it last year, but it takes me forever and a day to take the back off. It is really hard to pull apart and each time I do, I'm afraid that I am going to break it!