When shopping online, always use your credit cards instead of a debit card. If any fraud happens, it is far easier to recover your money from a credit card transaction. Gift cards and one-time-use credit card numbers are even more secure.
Do you plan on giving away or selling one of your older mobile devices? Make sure you wipe or reset your device before disposing of it. If you don't, the next person who owns it will have access to all of your accounts and personal information.