Joke Collection Website - Blessing messages - Why can't Unicom send text messages without arrears?

Why can't Unicom send text messages without arrears?

1. Unicom's signal difference, network delay, air SMS congestion. 2. If your mobile phone is a dual-card dual-standby center number, is there a "+"sign in front? 6.5438+0 card, please fill in the Unicom center number in the SMS settings. 2 card, if it is mobile, please set the mobile SMS center number to see if it is set wrong. 3. The quality of shanzhai mobile phone and network signal are not good. 4. There is something wrong with the mobile phone software and SMS settings.