Malaysian carrier Maxis has begun accepting pre-orders for the iPhone 3G, which will launch in the country on March 20. Maxis will offer the handset on a tiered pricing scale, dependent on which plan the customer chooses and the duration of the contract. For users choosing a 12-month contract, the 8GB iPhone will range in price from RM 1900 (roughly $514) to RM 1080 (~$292), while the 16GB model will range from RM 2290 (~$619) to RM 1470 (~$397),…