This afternoon, I went to the Apple service center to check my phone because it had bad signals.

A young female servertechnician greeted me.

If you meant 服務員, note that the phrase only translates to "server" only in the context of a restaurant.

I briefly told her about the problems with my phone briefly.

Afterwards, an engineer took my phone in a, placed it into some testing equipment and connected the equipment with a computer to check it out.

After about thirty minutes had passed, they told me that the phone didn’t have any problems and suggested that I change to a new phone card.

The China mMobile service center will get off workcloses at 6pm.

When I arrived at the center, I immediately got the phone card changed.

"Had the phone card changed" may be slightly better, but this is fine.

I will observepay attention to it fover the next few days.

It was almost 5 pm when I arrived.

I briefly told her about the problems with my phone briefly.

Afterwards, an engineer tookconnected my phone in ato some testing equipment and connected the equipment with a computer to check out.

After about thirty minutes passed, they told me that the phone didn’t have any problems and suggested that I change to a new phone card.

The China mobile service center will get off workcloses at 6pm.

I will observemonitor it fover the next few days.

I told her briefly about the problems with my phone briefly.

Afterwards, an engineer took my phone and placed it in a testing equipment, and then connected the equipment with a computer to check it out.

The China mobile service center will get off workould close at 6pm.

People get off work at a certain time, businesses close at a certain time.

When I arrived at the center, I immediately gotchanged the phone card changed.