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Hi, i want to know the mobile phone using as gsm module. i am very thankful to you.
Do you mean, you want to use a mobile phone as a GSM modem?
ie, instead of getting a proper GSM module/modem?
I think that is a Really Bad Idea - see: www.8052.com/.../152933
"The trouble with using a phone: is that they simply aren't designed for programmatic control - and certainly aren't documented or supported for it"
If you really insist on using a phone, you are going to have to do a lot of googling to find the necessary information - so you'd better get sharpening your google skills!
Besides having problems with power on/off, pin codes, battery charging etc, the lack of documentation can be really, truly serious for phones. Embedded modules are explicitly designed for use in embedded products.