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Usually they should tell you how to send you calculator in for service in the manual. That what they used to do before the web.
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Joined: Mar 2006
Start at www.hp.com -- "Handhelds" -- "Calculators" -- "Calculators Support"
Under "Matching Products" choose "hp 48gii graphing calculator" - choose "solve a problem" -- in the "Other support options" choose (the only one) "contact hp" -- under "Call HP" choose "Call technical support after you buy"
That's the roundabout way of telling you how to find the number, which is: 1-800-HP-invent (1-800-474-6836).
The voice recognition system didn't ever recognise my calculator product name ("HP-49G+ Graphing Calculator") but a Forum contributor recommended sticking with "other". Just say "other" a few times and you'll be connected to a "call director" (a human being!) who should then put you in touch with someone in calculator support.
(Before I found out about the "other" trick, I was shunted to all manner of offices and persons and only-tangentially-related-entities without ever getting where I needed to be. It really does appear to be a huge, sprawled-out, barely-connected, multinational monstrosity!)