if you like to turn off Automatic Screen Rotation on Nokia 5800, you should change Nokia 5800 auto roration settings, then Nokia 5800 will run in vertical mode, instead of running in horizontal mode or verrtical mode automatically.
To turn off auto rotation on Nokia 5800, go to the Main Menu > Settings > Phone > Sensor Settings > Turning Controls > disable “Auto-rotate Display” and Choose the options you want to change. now you have change auto rotation settings mode on Nokia 5800

Nokia 5800 and TomTom GPS compatible problems: I try to connect my Nokia 5800 with TomTom GPS Navigator, but it stops at the 65% mark on second stage! I have paired my Nokia 5800XM with a TomTom One via bluetooth to get the trafic info. the bluetooth Pairing works, but the TomTom is unable to connect to the Internet. TomTom says both devices are not compatible with each other. Is the problem caused by tom tom hasn’t updated their software to be compatible with NOkia 5800 phones? …

Free Nokia 5800 sports applications download list-RaceChrono and Reuters Sports. these  free sports apps enalbe you access more sports news on nokia 5800.
Free Nokia 5800 sports application – RaceChrono

RaceChrono is a GPS based lap timing software for nokia 5800 phones. It can be used for almost all types of racing and outdoor sport. RaceChrono has rich lap analyzing features suited especially for motor sports, making it a great alternative to traditional car, karting and motorcycle lap timers.  you can download free RaceChrono app for your nokia 5800 from  http://www.racechrono.com/download/  …

nokia 5800 call volume problem. My nokia 5800 call volume become so low, when I make or receive calls,sometimes the sound goes dimmer or no sound. the call volume issue annoy me so much. WHile on any call, the volume becomes so low that it becomes very hard to hear what the other person is saying but after sometime, the voulme returns to normal automatically but only for a short time. but this issue doesn’t happen while on handsfree. I update my nokia 5800 firmware, but it can not …

How to transfer contact numbers between Nokia 5800 SIM card to phone. you can copy contact numbers between from SIM card to nokia 5800 XpressMusic phone memory, or reversely. it can let you more easily to transfer phone book without sync.
how to copy all contact numbers from SIM card to 5800 phone:  from Contacts > Settings > Contacts to display > touch SIM memory to place a tick next to it > touch  Phone memory and Service numbers to untick them >  OK ,Tap Back >  Mark/Mark all > choose …

Nokia 5800 network settings for 3G and GSM. you can set up Nokia 5800 XpressMusic network for 3G, GSM individually or both.  it depends on your network service provider.
How to set up Nokia 5800 XpressMusic  phone network : from home menu >  Settings >  Connectivity > Network > Network mode > UMTS , GSM, Dual mode (there are three mode for your choice. UMTS is for 3G mode).
if you don’t know the network mode, you can make it serch manually. from  Settings > Connectivity > network > …