what difference between Payload and ShortMessage.

I send more than 160 characters message(180 character) with SubmitMode.ShortMessage come one deliversm

I send more than 160 characters message(180 character) with SubmitMode.Payload come two deliversm

Which SubmitMode use for more than 160 ...

I need to send extended chars as | ^ € { } [ ~ ] \ without using unicode because when I use unicode message maxlength becomes much shorter than initial 160 chars, so one message is splitted in two or more messages, and that has a cost.

Is there any solution?

Thank you a lot.