How will i have a code on my n70?
well, you can choose to use a 'PIN code' or a 'Lock code' or 'Memory card lock'
1. PIN code actually locks up your SIM card, so anywhere you put your SIM card, the message on your SIM card will not be read by anybody without knowing your password. It'll ask you password each time you switch on your phone, but after switched on, it'll not be locked anymore, so anyone can read your phone after switched on.
2.while Lock code, locks your mobile phone like 'keypad lock', the different is, instead of just pressing , left softkey and * button, you need to put password on it (it lock after certain idle time - or you can choose to lock it anytime you want by pressing the on-off switch one time (don;t press too long) and choose the belowest which said lock phone ). this type of lock is commonly used.
3.Memory card lock, locks any application which access your memory card, such as images, text, songs, data that is stored on your memory card. but this type of lock, often bring troubles when the memory card get corrupted. so I suggest number 2 type of lock (lock code)
WARNING!!! all password should be remembered, as if you forgot those password, no body can help you unless technician.. see those articles which people post when they forget their password, so you know the risk and the consequences. But they're actually safe as long as you remember ^^
Good luck, all the best!!