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 …

We all know that BlackBerry next upcoming phone is a slider phone.  BlackBerry now testing the market with the slider segment as before this we can only see from most of Nokia phone.
A week ago we can see BlackBerry slider leak picture. There is another picture from left side and top of the phone and comparison with 8900. [via]

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The Nokia E75 is a slide phone from the house of Nokia. The phone’s highlight is its strong multimedia capabilities.
Design
The E75 is a slim, sliding mobile phone with vital statistics of 111.8 x 50 x 14.4 mm. It is slightly heavy at 139 grams. The phone is available in Silver Black, copper yellow and Red to suit personal tastes of consumers.
The Nokia E75 has an alphanumeric keypad on the fascia and a QWERTY keypad that slides out from the left side of the phone. This handy QWERTY keypad with big …