Posted on the Advertising Standards Agency web site:
IMPORTANT - JAMSTER: We are aware of viewer concern about the current frequency of Jamster advertising and the terrestrial channels have been informed. If you wish to complain about the frequency of Jamster ringtone advertisements, please do not complain to the ASA. You should contact the broadcaster direct. The frequency of any particular advertisement is not part of the ASAs remit. Contact details for broadcasters can be found in Radio Times, or on the Ofcom web site: www.ofcom.org.uk. The ITV Duty Office can be contacted on: 0870 600 6766. For Cable or Satellite channels, contact the channel. The ASA can only consider complaints about the content of television advertisements, not the frequency of any particular advertisement.Obviously the'ye getting flooded.
See here for more.

Jamster's CUNTING FROG is a PLAGUE on the UK at the moment.
However, some light frog-relief is found on the ASA's website -- this ruling on the Crazy Frog's genitals, which, keen viewers will have noted, have recently been covered up:
Some viewers complained that the commercial was annoying and broadcast far too frequently. However, the main crux of the complaints related to a far more unusual and surprising subject matter. Frog genitalia. Viewers had noticed that Crazy Frog was very definitely male due to a protrusion that stuck out from his cartoon body. The complainants found this inappropriate. Some were worried about children seeing this kind of advertising material whilst a few parents had felt embarrassed by some of the questions their children had asked them. The ASA decided to formally investigate the complaints.
Though the ASA takes all complaints about offensive advertisements very seriously this certainly ranked as one of the more unusual investigations it had ever launched. However, despite the high volume of complaints, 60 in total, the complaints were not upheld.
Because the commercial prompted viewers to order the ringtone via text it had been given an ex-kids restriction and automatically moved away from being shown around programmes specifically made for children. With regards to the anatomical anomaly, whilst acknowledging it was surprising for genitalia to be shown on an animated frog the ASA found that there was no sexual or inappropriate references made about it. Furthermore, whilst it appreciated adults were concerned about the frog, it noted that none of the complaints reported children being upset. As an ex-kids restriction was already in place the ASA did not consider the genitalia to be a problem. Lastly, though the ASA accepted that advertisements which are broadcast frequently can rankle with some viewers, it didn?t uphold the complaints as it is the advertiser and broadcaster who decide how often they show a commercial. Full report in the Google cache
here.