A day after T-Mobile USA launched the G1 in conjunction with Google, it appears the carrier will be capping the data usage on its 3G UMTS network at 1GB, according to a report on Engadget Mobile.

The wireless carrier, in fine print on a link about its 3G UMTS/HSDPA data plans, said that if users exceed 1 GB of data usage in their billing cycle, their throughput speeds may be reduced to 50 Kbps for the remainder of the billing cycle, effectively ending a 3G connection. 

Data plans for the G1 run between $25 and $35 per month, with the $35 plan being touted as offering unlimited web, email and messaging access.

For more:
- see this post
- click here for the T-Mobile link

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