How u check?

Mine is perfect. 0% wear. Bought my phone last year end of December

11.2.1
I normally try to keep it charge between 60-90% if possible

Last friday morning when i wake up, the phone suddenly become no service. Then restart the phone still the same. Then i tried to reset network setting. then is working again. Then when i reach office, become no network again. 
Went to Digi to change SIM card, then able to get network again. After few hours, searching for network again.

Anyway, i sent to machine service center already. but bloody hell need to wait 10 working days.

Elevator no line is common for all telcos

Elevator no line is common for all Telcos no a?

To force restart (hard reset) the iPhone 8, press and release the Volume Up button, press and release the Volume Down button, and press and hold the Side button until your device reboots, then release.

Just updated to 11.3, gonna monitor the battery life

does anyone users here experienced that your 8+ get warm pretty easily when you gaming (ie: mobile legend/asphalt)? sometimes even feel hot after a few games.

Not playing and charging battery at the same time though. but usually only occurred when gaming, under normal usage it won't heat up, unless using under an environment that is hot.

the heat usually around the power button/under camera part.

read this article by Apple's support page:
https://support.apple.com/en-my/HT201678

I used to worry like you too.. till I read this 

If you're playing a game that doesn't support your current iPhone well (e.g. old iphone 6S, weak battery iphone etc), expect it to crash or lag a lot and gets very hot. Phone might even restart by itself to cool down from overheating.

Most dangerous is when you use an unbranded iphone charger or cable (those without any brand and sell for RM1-5 dollars - avoid please).. those can literally blow up your phone due to the cheap parts present in it. If possible use iPhone's official charger or a good branded powerbank.. cable a good branded one like Remax etc is good enough. Branded 3rd parties also want to protect their image.. so they are more trusted.. they're in the market for a long time already too.

You guys must be heavy users to still need a power bank with the iPhone 8+

ya lor.. even when i go travelling, whole day outside, gps / take pic / facebook / google translate.. i still reach back to hotel at night about 20-30%
didn't find the need for powerbank.. 

I don't game either

Ya, it's a pity the only Androids with big batteries are midrange ones (Lenovo P2, Mi Max 2)... Can't exactly play heavy games on those! I wouldn't exactly call myself an iFag but more often than not I prefer the boring reliability of iOS.