Sanyo SCP-4000 - Manual (Page 83)

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Maintaining your phone’s peak performance
To operate your phone properly – that is, to maintain safe and
satisfactory service – you should follow these rules:
For best reception, fully extend the antenna.
Hold the phone with the antenna up and over your shoulder.
Do not hold the phone antenna at any time.
Do not use the phone with a damaged antenna.
Speak directly into the mouthpiece.
Avoid exposing your phone and accessories to rain or liquid spills.
If your phone does get wet, turn the power off immediately and
remove the battery. If it is inoperable, you should return it to a
Sprint PCS Center or call Sprint PCS Customer Care for service.
Only authorized personnel should service your phone and its
accessories. Faulty service may invalidate the warranty.