1, g refers to GPRS, which is a mobile data service that GSM mobile phone users can use. GPRS is a continuation of GSM and a 2.5G network. Show o on iPhone.
2.e refers to the EDGE network, which is an enhanced data rate GSM evolution technology and belongs to 2.75G.
3.3G refers to ordinary 3G network, and Unicom is WCDMA, with a speed of 2-7M.
4.h is found on Unicom's WCDMA mobile phone, which refers to the HSDPA network after 3G upgrade, 3.5G, and the speed can reach14.4m.
5.H+ is common in China Unicom's WCDMA mobile phone. Hsdpa upgrade, HSPA+, 3.75G, the speed can reach 2 1M-42M.
Bad signal factors:
The signal strength of the operator's base station in the environment, if it is in the city (except for special environments such as underground passages), basically there will be no signal difference for the officially listed mobile phones. So it is estimated that you often go to places where the base station signal is not good. If the signal of the local base station has almost no coverage, the result is the same as any mobile phone, that is, the signal is poor or there is no signal.
However, where the coverage signal of the base station is poor (the technical term is that the received signal strength of the mobile phone is lower than-100dbm), the performance of the mobile phone will be tested. If the performance of the mobile phone is not good, it will happen that someone else's mobile phone has a signal and your mobile phone has no signal.