Yes, you can use an sd card to increase RAM in an android phone. This may certainly help you to play some heavy game and may run many application at same time. But its not the perfect solution as things depends on your processor and other hardware also. But increasing ram can help you a lot and is very easy.
There are basically two methods through which you can achieve this. First method is by using the the premium App ROEHSOFT RAM Expander (SWAP) while the second method is a free method.
Find all the details here http://www.infocurse.com/trick-convert-sd-card-increase-ram-of-android-smartphone-tablet/
yes you can use micro SD card as ram in android phone. I did with the help of this great article. You can see the proper steps to increase the ram in android phone by SD card from this http://www.atechreview.com blog
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