With the new and improved O2 Tandem service, you can set up advanced joint calling accounts with friends or family, or build a calling network within your company – all with one account and one statement.
With the O2 Tandem service you can expand your current O2 account by adding up to three secondary SIM cards to your current SIM card. With O2 Tandem, you gain exceptional discounts on mutual calls and SMS messages while managing only one monthly account.
Secondary SIM cards can be used by family members, friends, colleagues, or employees. You'll save money on mobile communications, and you'll always be kept up to date on your account, including the activity of all Tandem SIM cards.
