Locking The Keys; Using An Optional Memory Card - Samsung SGH-i610 User Manual

Locking the keys

You can lock the keys on the phone to keep any accidental
key presses from causing a program's launch or phone
switch on or off.
To lock the keypad, press
To unlock the keypad, press the Unlock soft key and then
press .

Using an optional memory card

Your phone has an expansion slot compatible with microSD
memory cards, which are primarily used to back up or
transfer files and data.
Note: Use only compatible memory cards with your phone.
Using incompatible memory cards, such as Secure
Digital (SD) cards, may damage the card, as well as the
phone, and data stored on the card.
Inserting the memory card
Push the memory card into the slot with the label side face
up until it clicks into place. The card is secure when it is not
protruding from the phone.
and select Key lock.
The basics
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