iPhone 6s Plus increase memory by getting new SIM card?

No. A SIM card holds the cellular carrier's settings and your phone number. It is not storage nor memory.

You cannot change the amount of memory or storage space on an iPhone.

No.

Nope

Hi

There is no memory on a simcard.

The only way is to upgrade your iPhone to one with 128G / 256G

Cheers

Brian 🇬-1F1E7;