If you want to bind with GSM, you can apply for a "1+ 1" card in your own business hall, that is, China Mobile's "GSM", "Business GSM", "Happiness Card" and "M-Zone" customer inquiries can all be bound as "1+ 1. After the two numbers are bound, the phone charges of the two numbers are paid by the main card.
Matters needing attention in handling this business
1.GSM and GSM cannot be used as supplementary cards.
2. All brands that can apply for "1+ 1" family cards can't make free calls for 300 minutes if they have enjoyed the free call time.
3. If the note number is in arrears, the sub-number will also stop using.