I have been reading through all these threads about SSI and there is one thing I can't figure out. When you first apply for SSDI with SSA, do they automatically sign you up for SSI or do you have to ask? Nobody at SSA ever mentioned SSI to me. I have read where if you get SSI and then SSDI, you have to pay back all or part of the SSI. That don't make donkey sense. I realize that SSI could help most folks including me during the SSDI nightmare but whats the use if you have to turn around and pay it back?