Q:

What is the limit for 3G marketplace downloads?

When I am trying to download some of the bigger apps/games, marketplace blocks the download until the phone has WiFi connection available. What is the limit for this? 10, 50, 100 MB?

A:

The limit is 20 MB
When the download size is larger than 20 MB and you are connected on a 3g network you'll receive the "Attention required" message.
If you connect to wifi you can tap the attention required message and press retry.
source: Microsoft WP7 Download apps and games FAQ

