My cool smartphone can't send text messages, and it always doesn't go out?

Owe telephone bills;

SMS center numbers are inconsistent;

Manage applications-all address books, clear cache and data;

Activation of address book/contact has been disabled;

Take out the battery and restart it;

Test the SIM card on another mobile phone;

Use third-party communication software;

Restore factory settings;

Brush machine, it is best to use official ROM.

1 and "Coolpad" are mobile phone brands of Yulong Communication Company.

2. Yulong Communication Company, whose full name is "Yulong Computer Communication Technology (Shenzhen) Co., Ltd.", is a wholly-owned subsidiary of China Wireless Technology Co., Ltd. (listed on the main board of Hongkong, stock code 2369). China is a professional provider of integrated solutions for smart phone terminals, mobile data platform systems and value-added services, focusing on integrated wireless data solutions with smart phones as the core, and is committed to becoming a smart phone leader and an application expert in the wireless data industry.