Is the Armor X31 good for gaming?

It is not a gaming phone. The Helio G91 with Mali-G52 handles everyday apps and casual games, but demanding titles will need lowered settings. The 90Hz screen helps scrolling feel smooth.

How long does the 6050mAh battery last?

Ulefone rates the cell at 6050mAh, which is well above typical budget phones and should get most users through a full day or more of mixed use. Charging is 18W, so a full top-up takes a while.

Can I use two SIMs and a memory card at the same time?

Yes. There are three separate slots: two Nano-SIM slots and one microSD slot, so you do not have to give up a SIM to add storage. The card slot accepts up to 2TB.

Does it have NFC for contactless payments?

Yes, NFC is listed among the sensors, so tap-to-pay and NFC tags are supported. It also includes a gyro, barometer and pedometer for fitness and navigation use.

What is the dynamic RAM feature?

The phone ships with 5GB of physical RAM and lets you add up to 6GB of virtual RAM from Settings. That can help keep more apps in memory, though it is not as fast as physical RAM.

Is the Armor X31 waterproof?

The listed specifications do not state an IP water or dust rating. Treat it as a rugged, heavy-duty phone but do not assume it can be submerged without a stated rating.