There is no correct way on how to hold the Nokia phone according to the Nokia blog. The phone supposed to work without loss any signal quality on the way you hold the phone.
The blog post is in response about the way you hold the iPhone 4 as wrong way to hold the phone will decrease the signal quality.
According to Nokia Blog, there are 4 ways to hold Nokia phone. It called, Thumb and finger, The cup, The balance,
and The four edge grip.

Head over to the Nokia blog for …

Select Options > Settings to change the starting day of the week or the view that is shown when you open the calendar.
To go to a certain date, select Options > Go to date. To jump to today, press # .
To switch between the month view, week view, day view, and to-do view, press *.
To send a calendar note to a compatible device, select Options > Send.
If the other device is not compatible with Coordinated Universal Time (UTC), the time information of received
calendar entries may not be displayed correctly. To …

To delete more than one event at a time, go to the month view, and select Options > Delete entry > Before date or All entries.
To mark a task as completed, scroll to it in the to-do view, and select Options > Mark as done.

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Your device is compatible with UPnP architecture. Using a wireless LAN access point device or a wireless LAN router, you can create a home network and connect compatible UPnP devices that support wireless LAN to the network, such as your Nokia N81, a compatible PC, a compatible printer, and a compatible sound system or TV, or a sound system or TV equipped with a compatible wireless multimedia receiver.
Using the wireless LAN function of the Nokia N81 in a home network requires a working wireless LAN home
connection setup and the other …

You may view and update the current software version of your device, and check the date of a possible previous
update (network service).
Press , and select Tools > Utilities > Device mgr..
To check whether software updates are available, select
Options > Check for updates.
Select an internet access point when asked. If an update is available, information about it is displayed. Select Accept to accept to download the update or Cancel to cancel the download. The download may take several minutes. You can use your device during the download. Downloading software updates may …

You can use your device with a variety of compatible PC connectivity and data communications applications. With Nokia Nseries PC Suite you can, for example, transfer images between your device and a compatible PC.
Always create the connection from the PC to synchronize with your device.

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Scroll to a software package, and select Options > Remove. Select Yes to confirm. If you remove software, you can only reinstall it if you have the original software package or a full backup of the removed software package. If you remove a software package, you may no longer be able to open documents created with that software.
If another software package depends on the software package that you removed, the other software package
may stop working. Refer to the documentation of the installed software package for details.
Settings
Select Options > Settings and …

When you configure your wireless LAN home network, enable an encryption method on your access point device, then on the other devices you intend to connect to your home network. Refer to the documentation of the devices. Keep any passcodes secret and in a safe place separate from the devices.
To view or change the settings of the wireless LAN internet access point in your device, see ‘Access points’, If you use the ad hoc operating mode to create a home network with a compatible device, enable one of the encryption …

When you are not using Bluetooth connectivity, select
Bluetooth > Off
or
My phone’s visibility > Hidden.
In this way, you can better control who can find your device with Bluetooth connectivity, and connect to it.  Do not pair with or accept connection requests from an unknown device. In this way, you can better protect your
device from harmful content.

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There is two way to reset you N81 phone, either use Tools>Settings>General>Factory settings to reset to factory setting or you can reset to format which is erasing everything in the phone and revert back to the original setting.
To format just key *#7370# and it will ask for security code. The default code is 12345
N81 codes
*#06# ………… IMEI number (International Mobile Equipment Identity)
*#0000# ……… Firmware version and date, Phone Model and Operator Variant
*#92702689# … Life timer (W A R 0 A N T Y) – Total time your phone has spent …