Go in to build mode and click on whatever you don't want anymore and then hit the delete button.
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Go to - My Documents -Ea Games -The Sims 2 Delete the entire The Sims 2 folder. Then go to your game. The game will automatically create a new The Sims 2 folder. If you have custom content installed and don't want to delete it, before you delete The Sims 2 folder, move the Downloads folder to Desktop, delete The Sims 2 folder, go into your game, then exit out of it and move the Downloads folder back into The Sims 2 folder.
press delete account,dude.
Delete the tombstone.
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I don't know about sims 3 mobile but in sims 3 you bring up the cheat box (CTRL+Shift+C) and type in testingcheatsenabled true. Then hold shift and click on the sim you want to delete, and it will say "Objects...". Click on that and from that menu select Delete it.