Unless your friend's SIM is more than a year old, this should be what you need:
NAME: Straight Talk
APN: tfdata
PORT: 80
MMSC: http://mms-tf.net
MMS PROXY: mms3.tracfone.com
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MMS PORT: 80[/FONT]
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Otherwise, have your friend check here for the exact info (just skip any proxy info for the Data APN):
[/FONT]http://www.straighttalk.com/wps/portal/home/support/apn
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Make sure that this is entered into the Nokia Access Point app, and not the standard Windows Phone APN settings. Otherwise it may not work properly.[/FONT]