How to change my IP address on my computer and iphone?

I want to change the IP address on my computer and iphone as i feel its being used to get access to my accounts. Is there a way to to go about this?

You have two IP addresses
1. Local: assigned by your modem/router
2. Valid: assigned by your ISP

the first one you can change by going to you connection properties
the second one is assigned by your ISP, if you have a static/valid IP address you can change it by calling up your ISP and asking for it to be changed. But you probable don't have a valid IP address, so explain exactly why you are trying to do

The IP address is allocated to you by your ISP when you connect to their network. Disconnect from the network and you will be allocated a new IP address when you reconnect.

You may need to leave it disconnected for sometime (possibly overnight) depending on how regularly your ISP reallocates IP addresses. For some broadband type connections they may use a "sticky" IP address which will stay the same for extended periods even when disconnecting and reconnecting.

It is not very likely that anyone would be sufficiently interested in you or your accounts to go to the trouble of accessing them in such a way.

Most routers have the ability to limit access to your network to only known devices. You would add the MAC address of your computer and phone to the list and then anything else would be blocked.

Netgear example…

http://kb.netgear.com/app/answers/detail/a_id/13112/~/securing-your-wireless-network%3A-access-control-list

Check out tutorials below.
http://www.ip-address.org/change-ip.php
http://www.ipaddresslocation.org/change-ip-address.shtml

If you are behind router and your ISP allow changing then you will probably be able to change IP.

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