wvidal gives low mobile broadband speed

Binary package hint: wvdial

When using wvdial to connect to a mobile broadband, the download speed becomes capped at around 1 Mb/s, even though it is really capable of around 4 Mb/s. I have attained 4 Mb/s on the same computer using Windows Vista and also using Ubuntu by connecting with network-manager (network-manager doesn't work anymore; see <https://bugs.launchpad.net/ubuntu/+source/modemmanager/+bug/465766>).

To reproduce:
1. Establish a connection by using wvdial.
2. Download something large and monitor the download speed.

ProblemType: Bug
Architecture: i386
Date: Mon Nov 9 14:09:30 2009
DistroRelease: Ubuntu 9.10
Package: wvdial 1.60.1+nmu2ubuntu1
ProcEnviron:
 LANGUAGE=sv_SE.UTF-8
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: wvdial
Uname: Linux 2.6.31-14-generic i686