What is the third-party contract signed by Unicom when recruiting?

To put it simply, you work in Unicom, but the unit that signed the labor contract with you is the labor dispatch company. You have a labor dispatch relationship with Unicom and a labor relationship with the dispatch company.

Your related benefits are arguably lower than those of employees who directly sign labor contracts with China Unicom.

If the sending company pays you five insurances and one gold according to the provisions of the Labor Contract Law, you can also accept the wages offered at the same time. It doesn't matter.