what will happen if i format my SD card on my android phone?

If you format the card, everything saved to it will be lost. If there is anything worth keeping, then back it up to a computer or another suitable storage medium.

Formatting any storage device (Memory Card, Internal Memory, Hard Drive) means to completely clear the storage space and set the "File System" (NTFS, FAT32, ext2, etc.). When formatting a storage device in a mobile phone, your phone will format the storage device to the most compatible file system for the phone. FORMAT WITH CAUTION! When formatting a device, ALL data is lost (usually permanently). Another word of caution, make sure you have good battery levels on your phone. Interrupting a device while formatting can cause serious and sometimes irreparable damage to your storage medium. Good luck! Hope I've helped you understand reformatting a little better. As always remember to regularly backup your files. Try looking online for the latest LG Software package for your phone, this will more than likely have a feature to back-up your phone; Pictures, Movies, Messages, Contacts and all.

My recommendation to you is to consider a larger SD card. 8GB SD cards can be bough on eBay for as little as $8 with free shipping!

use manufacture reset in your settings but save your Contact on your sim card and your photos from your album

i wan to put pics from my micro SD which i had in my android to laptop, but laptop it is asking to format. what should i do then?