Why does telecom receive short messages slowly but move quickly, up to two seconds? Sometimes the telecommunications can't be received for hours.

First of all, from the communication point of view, there is no big delay.

Secondly, considering the local signal problem, there are three kinds, 1, where there is no base station, the signal coverage is not good, just like you usually surf the Internet, and the local network with poor signal must be intermittent; 2. There are many base stations, but the traffic is dense, and the switches are seriously occupied, resulting in response delay; 3. The traffic of base stations and people are in the normal range, and the use of program-controlled switches is congested, resulting in data delay. For example, on New Year's Eve and Spring Festival, many zero-point greeting messages are congested.

Of course, it does not rule out the signal instability caused by the contact between the mobile phone and the SIM card.

So ... it depends on the situation.