I try accessing the Market on the G1 and gives me a force close notification. It shows this - sorry! The application Market (process com.android.vending) has stopped unexpectedly. This has been going on for a wile . Could this be because im not connected to the internet? please help. Thank you .

T-Mobile posted a solution to this problem here (I had the same problem and this resolved it): Error "The process Genius Button has stopped unexpectedly, force stop": myTouch Q by Huawei

this means that the program you were running has crashed. If it happens everytime you launch a particular application then I would advise removing the program from the tablet and then reloading it

You may try default phone and security code to remove restrictions.
ur defalt phones codes is 12345 or 00000 u can use it
Default 4 Digit user code: 1234 or 0000
Default 6 Digit Security code: 123456 or 000000

Type *#06# at the mobile screen to know IMEI no of your mobile.
send the IMEI no to me and i will reply you with unlocking code.
IF Problem not Solved So
Please New Software install in the Phone Problem will Solved

Open Menu
Choose Settings
Choose Applications
Choose Manage Applications
Select the application called "Google Apps"
Select "Clear Data"
After a little while a notification will popup in the status bar prompting you to se up your Google account info
Enter the new Google account information
Reboot the cellphone

Please be aware you will lose info that is usually synched to Gmail such as your contacts and calendar information!

As an alternative to the above procedure consider doing a "factory reset" (not described here).

HI FRIEND ITS YOUR ANSWAR
Overview In today's fast-paced world, it's easy to lose track of the really important things in your life. Your social calendar is just a bit out of synch and friends are just a bit too far out of reach. Until now... The T-Mobile G1™ redefines what it means to be kept in the loop.
Feel the exhilarating power and freedom of having all the communication tools you're used to in your hand. Mobile Internet services are at your disposal with quick one-touch access to Gmail™, YouTube™, Google Talk™ and Google Calendar™. Explore even more of the world with detailed street, traffic and satellite views via integrated Google Maps™.
Dazzle your friends with the large sensationally crisp 3.2" display. The touch-sensitive navigation is finger friendly and super intuitive but you can swing it out of the way to use the full five-row QWERTY keyboard. There is plenty of room to respond to emails, messages and even chat.
G1 delivers an extraordinary browsing experience. The G1's browser comes with a clever multi-page window pane; it lets you surf multiple websites at the same time. Drag the page around with your finger to pan, or move from one link or textbox to another with the handy trackball positioned perfectly for your thumb. And don't worry about waiting for pages to load. The G1 is equipped with 3.5G and Wi-Fi technology... seamlessly switching to always offer you the best connection.
Instant notification bar discretely alerts you of emails, text messages or IM sent your way. Whether you're getting mail from Gmail™, another POP or IMAP account or receiving IMs from any of the most popular services, you'll be alerted as soon as a new message comes in.
Make the G1 your G1 with instant access to Android Market™. The market is constantly updated with exciting new applications for your T-Mobile G1™. Download and install your favorite software, music or games and more. The fully customizable home screen lets you put all the tools and gadgets within your finger tips.
HTC innovation delivers the next generation in mobile technology with the Android™ powered G1.

Highlights
3.2-inch TFT-LCD flat touch-sensitive screen with HVGA (320 X 480 pixel) resolution. Full 5-row QWERTY keyboard. One-Touch Google Search™. Customizable Home screen with instant Email, text message and IM notifications. Instant access to mobile Internet services (Gmail™, YouTube™, Google Maps™, Google Talk™, Google Calendar™). High-speed 3.5G network connection. Wi-Fi technology with seamless transition to open networks. Android Market™ with access to variety of software and media downloads. (some fees may apply) 3.2 megapixel color camera with auto focus. microSD™ (SD 2.0 compatible) expansion slot for all your storage needs.IDRISH 911

Same problem here, anyone know anything?

To put pictures on your SD card all you need to do is attach the G1 to your computer, mount the SD card when the notification comes up on your phone, and then copy and paste any pictures you want onto it. However, you can't save applications on the SD card, they are saved in the phone memory when you download them from the Android Market.

there is an application called missed call in the androind market u can change colors for the led light, its cool. another cool thing about this app is its "unique volume control" for different volume controls.

my phone keeps force closing when texting....i spoke to t mobile and they keep saying its something to do with people on o2... i think t mobile is completely clueless but never the less bit right as it is people on o2 which it keeps force closing and re sends back dated messages...lol which actually confuses most of my friends... if anyone knows why this happens please help

Try downloading Txtract from the G1 Market. It's listed under "tools". Use this application to save the text messages you've been hoarding to your SD card, then delete the text messages from your phone. Your G1 will work like new again!