Why does Samsung s2 1u sometimes get no sound when answering the landline or the takeaway brother's phone?

Maybe it's because the signal is bad. You can check whether the cell phone signal connection is normal.

If the cell phone signal is bad, you can complain. The most effective way is to complain to telecom operators. Mobile users can log on to China Mobile official website-Service and Support-Complaints and Suggestions, and someone will contact you to solve the complaint within 72 hours.

Samsung mobile phone is a smart phone developed by Samsung Group, and it really started to be popular all over the world from the A series. Series A was originally a folding mobile phone series, and the earliest Samsung SGH-A 188 (white shape) and Samsung SGH-A288 (dual screen inside and outside) are both classic works. Galaxy series can be said to be the most successful series of Samsung mobile phones so far. In the Galaxy series, Samsung adopted Android's smartphone operating system.