The other day, my friend and I who are using the same service provider found that her phone did not get any signal while mine did. We were both in the basement of a shopping mall. She cannot make a call from the car park while my phone shows the signal is fine.

She told me it could be due to her Korean brand cellphone and I do think it could be a cause. Since both of us are using the same provider, it has to be, right? I heard there is a gadget call cell signal booster and it helps for those locations which get poor signals.

I have never seen a unit before but it is available on the link provided.