Guides
Comprehensive guides covering number marking clearance, appeal processes, number authentication, and SIM card selection for Chinese phone numbers. Each guide includes step-by-step instructions and material checklists.
What Is Number Marking?
Learn how phone number markings work in China — where they come from, why your number got flagged, and how the multi-platform marking system works.
How to Check Number Marking
Step-by-step guide to checking your number across all major Chinese marking platforms — 360, Tencent, Huawei, Baidu, Sogou, and Truecaller.
How to Clear Number Marking
Complete appeal tutorial: from identifying marking sources to submitting clearance requests on each platform, with material checklists.
How to Clear Landline Markings
Landline number marking clearance is different from mobile. Learn the specific channels for fixing landline/spam designations on home phones and business lines.
What Is Number Authentication?
One-tap login and local number verification explained — how carrier-gateway authentication works, security, pricing, and HarmonyOS support.
SIM Card Selection Guide
Carrier comparison (China Mobile / Unicom / Telecommunic), number selection rules, premium number strategies, and porting (MNP) guidance.
