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What does China Mobile family number 522 mean?

After one customer forms Qingqin.com, he or she can invite up to 9 customers to join; customers who form Qingqin.com can allocate 3 different numbers between 520-529 to themselves and other members of Qingqin.com. Qingqin.com short number (of which 520 short number is the main number of Qingqin.com), members of Qingqin.com can use the short number to make calls, and send short number SMS and short number MMS. Calls between members enjoy Qingqin.com tariff discounts.