What's the difference between 3G mobile phones and ordinary mobile phones? ? Can 3G mobile phones receive short messages in shielded places?

It depends on the standard, including td-scdma (Mobile), WCDMA (Unicom) and CDMA2000 (Telecom). Ordinary mobile phones are all GSM networks, and some are CDMA 1x, which has much slower data transmission and does not support video calls. 3G has a camera above the mobile phone screen for video calling. The fastest transmission speed theory can reach 13M (I tried it in Unicom's business hall, and the download can reach 565kb/s, which is dark and fast). The more people use it, the more unhappy they are ~ ~ ~

As for the place where the cell phone signal is blocked, I think that except for the military phone (I have never tried the satellite phone, it should be the same), no other cell phone can receive the signal. Of course, you can't receive text messages without a signal.