"How much to repair the left button with a crack?"に関する回答Most shops will charge between $40-$65 for the iPhone 4/4S Screen Repairs. The cheapest repairs around are 99% of the time using a cheaper quality LCD (lower quality screen = lower price). If you plan on keeping that phone for a little while, try to find a shop with a good warranty behind their parts. Good luck in your search!
"Best glue for attaching screen to phone?"に関する回答There is an adhesive called 'Red Tape' that is very, very good adhesive. We swear by it for any and all adhesive jobs we run into. Just make sure that you get everything right the first time, because separating Red Tape can be a real pain.
"How to remove sim and micro sd card housing?"に関する回答Hey there, Milin. I hope this helps. Use the iFixit Guide from here to remove your Galaxy S4 Back Housing and Mid-Frame. From here you'll just disconnect the Sim Tab from the motherboard and transfer it over to your new board.