Please take care when removing the antenna. The following pictures should help you. You will need to use a small screw driver like in FIG 1. Then proceed to FIG 2. Arrows facing upwards are slots only.
Arrows pointing to the sides are the clips.
Step 3 Remove the four torx screws with a t6 driver then the silver plate can be removed. There is no need to remove the sim card. Once the plate has been removed you will need to turn it over and slide the motor onto the chrome plate like in fig.1. Now you are ready to reverse the process by refitting all the parts, Once you have rebuilt your 3210 you will need a 3210 cable and the vibrating software. Always read the phone contents before writing.