In the future, XML generation will simplify the content generation issue. There are several transmission standards in effect, and some of the new standards offer the potential for much faster data transfer rates. In the interim, downloading a long message or uploading data you've typed in can be tedious. A recent sampling of available phones show limits from 1400 bytes to 8000 bytes. WML designers must take this into account, although it can be hard to estimate the final binary size based on the plain text WML file.
Battery life is also an issue.
As a cell phone is required to send and receive more data, perform more processing and interpret more keyboard commands, battery life is drastically reduced. User interface One of the largest issues confronting designers is the user interface. It is very difficult to query the device and then adjust the display size and resolution on the fly. Most cell phones use some variation requiring multiple key strokes per letter. Typing in a long URL then becomes a challenge and a burden.