Can memory from a memory card be used to increase RAM on an Android phone?
No memory card is no where related to RAM. RAM is an internal memory and volatile in nature. memory card is non volatile in nature. I think you just want to speedup your android phone for that search some good application which could speedup your android phone because even you can not increase the RAM of your android phone It is manufacturer built.
I don't know any way to do it, but I can inform you that there's a way to turn the SD card memory into internal memory, wich is quite good!
You may inform
You had previously asked this question -
Now,you can do this but there are some trade offs as it used to be before -
SD card lifetime will decrease due to high read/write operations.
phone needs to be rooted.
performance hit as SD cards are slower than NAND flash.
Kindly have a look at the link below to know how to achieve what you are thinking of -
I voted your answer plus
you need rooted android also kernel support
Increase RAM using Swap File and Swap Partition
How To Enable SWAP Memory On Android
if swap app is not compatible with device
Swap partition works with kernels that supports swap partition
also swap may degrade sd card life?
How can I tell if swap is running?