After a request for a MAC it should be provided by the ISP within five working days. MACs are valid for 30 days once issued, providing the customer with the opportunity of switching ISPs within that period. It usually takes around three to ten working days for accounts to be switched over from one ISP to another.2
The code was first introduced by Ofcom and BT as a voluntary code of practice. However, as of 14 February 2007, the rule became compulsory (General Condition No. 22: Service Migrations). This meant that if a broadband customer requested a MAC from their ISP then the provider must supply one free of charge.3 The rules were implemented in order to ease the process of switching ISPs. Switching customers will usually only lose their Internet connection for up to a few hours during the migration.
As of 20 June 2015 the MAC code is no longer required to enable switching of ISPs.4 A customer who wishes to change broadband provider now only needs to request the service from the gaining provider.
The grounds on which an ISP may refuse to issue a MAC are:5
Some ISPs, such as Pipex67 were reported to be unwilling to provide MACs even if they have no reasonable grounds for refusal.
On at least one occasion, in a crisis situation, BT set up a help line to enable customers to get their MAC codes directly from BT Wholesale.8
"Help with your account – Help & Support – Plusnet". www.plus.net. http://www.plus.net/support/customer_service/using/request_mac_key.shtml#1 ↩
"TalkTalk Broadband - MAC Code Frequently Asked Questions". Archived from the original on 6 September 2006. Retrieved 14 May 2007. https://archive.today/20060906202022/http://www.talktalk.co.uk/talktalk/servlet/gben-server-PageServer?article=MAIN.UK.TALKTALK.STATIC.HELP.BBHELP.MACCODE ↩
"Latest Topics – ZDNet". ZDNet. Archived from the original on 25 January 2007. Retrieved 14 May 2007. https://web.archive.org/web/20070125193407/http://news.zdnet.co.uk/communications/0%2C1000000085%2C39285135%2C00.htm ↩
"Easier broadband switching from tomorrow". Ofcom. 20 September 2016. http://media.ofcom.org.uk/news/2015/easier-bb-switching/ ↩
http://consumers.ofcom.org.uk/codes-of-practice/migrations-authorization-code-mac-broadband-migrations-process/[permanent dead link] http://consumers.ofcom.org.uk/codes-of-practice/migrations-authorization-code-mac-broadband-migrations-process/ ↩
"Archived copy" (PDF). Archived from the original (PDF) on 8 February 2009. Retrieved 23 January 2009.{{cite web}}: CS1 maint: archived copy as title (link) https://web.archive.org/web/20090208030739/http://www.ofcom.org.uk/bulletins/comp_bull_index/comp_bull_ocases/open_all/cw_946/pipexs94.pdf ↩
Jackson, Mark. "Ofcom Details Pipex Broadband Migration Failures : ISPreview UK News". www.ispreview.co.uk. http://www.ispreview.co.uk/news/EkFkFZFFAZCpJMOldX.html ↩
"Ofcom learns lessons from Biscit fallout". The Register. Retrieved 22 June 2009. https://www.theregister.co.uk/2007/03/23/biscit_fallout/ ↩