This is a tip for the USA readers currently under AT&T contract, but want to enjoy 3G data on the Nokia N900. Since the N900 does not support AT&T’s 3G frequency, you have to use a T-mobile SIM card. Tmo’s Flexpay Monthly plan doesn’t require a long-term contract, so you can just get one at their stores without signing your soul away for the next two years.
Step 1. Go to a Tmobile store and tell them you want a Flexpay monthly account. Tell them you already have a phone to use it with but you don’t have it with you at the moment. Check the reason at the end of instructions.
Step 2. They’ll ask which plan you want. Since you already have AT&T, you probably don’t need minutes on the T-mobile account. The cheapest option is $29.99 for 300 Whenever minutes with unlimited weekends.
Step 3. Tell them you’ll add the extra services (like the data plan) later on.
Step 4. Sign the papers, then leave the store with your new Tmo SIM card.
Step 5. Insert the SIM card into the Nokia N900 and register/login at my.t-mobile.com with a computer or laptop. Tmobile will not recognize the Nokia N900, so change the phone in your dashboard to one of the Nokia phones. The default for me was a Tmobile G1. I changed it to the Nokia 5310.
Step 6. Go to Manage Services and add data access for your account. It is $9.99 per month for unlimited web.
Step 7. That’s it. Now you have a Tmobile SIM to use 3G on the Nokia N900. After taxes, it adds up to about $50 a month. The good news is that you’ll be able to end the plan anytime you want. This is a temporary fix until a Nokia Maemo device compatible with AT&T’s 3G frequency comes out.
Step 1a. If you tell them that you have it with you, they will scan the N900 for the IMEI number. Since it is not in their system, they will force you to pay the $24.99 data plan instead of $9.99.
Switch or Second SIM?
I don’t think you’ll enjoy using the N900 with an EDGE connection. 3G or Wifi is a must, but it will cost another $50 per month for current AT&T customers. Will you switch or get a second SIM for the Nokia N900?