Consumers should use their home broadband connections to stream videos and play online games, according to one internet service provider (ISP).
T-Mobile is urging its customers to bear in mind that the smartphone mobile internet is designed primarily to support basic browsing and email use.
With this in mind, the broadband provider has cut its mobile data allowance to 500MB per month, down from 1GB or 3GB depending on users' contracts.
However, the firm says smartphone users will no longer be charged for exceeding their monthly allowance, providing they avoid using high-bandwidth services.
"If you want to download, stream and watch video clips, save that stuff for your home broadband," T-Mobile stated.
The ISP told PC Pro that its revised fair usage policy was "in line with the industry".
"These restrictions will affect both new and existing customers, and ensure an improved quality of service for all of our mobile internet users," a spokesperson stated.