How to buy social security after entering Dongguan?

You must buy social security again in Dongguan, and the social security of your hometown should not be refunded, but kept all the time. When the conditions are ripe (the reply from the Social Security Bureau is that you can transfer the social security of your hometown after you have bought social security in Dongguan for 15 years), you can transfer to Dongguan. If you are hospitalized in Dongguan, you will pay for it with social security purchased in Dongguan. With the development of society, social security may be unified nationwide in the future, and all your social security may be unified into one account without transfer, but before that, you may still have to follow the transfer system.