Another question about the "air-gap" I maybe am not understanding some part of the Ethereum protocol that is important to knowing how this can work... If the

Another question about the "air-gap" I maybe am not understanding some part of the Ethereum protocol that is important to knowing how this can work... If the wallet is stored on the device, and the device can only receive payment requests over BLE and nothing else, and the device does not store the block chain, and the device does not have Wi-Fi to go out and ask for information about the block chain state, how can the device know its own balance, or know whether it has sufficient funds to sign a transaction? (Can it sign transactions that it can not immediately fulfill from the stored balances? Can they be used as IOUs?)