First of all, it's painful to read your message. Please use real words and capitalize.
Most airlines have a carry-on size limit of 7"x14"x21". I have a Downtube Mini and it fits within the checked size limit of L + W + H <= 62", but it's definitely not a carry-on. The Brompton (depending on features) is about 23"x23"x10", too big and thick to carry on. Airlines used to be more open about cheating, but now they really want the money from making you check more bags. I'm pretty sure that the Strida and CarryMe are longer than 21" when folded, but their narrow fold might make them easier to sneak by.