The book follows Kit, a 12-year-old who is transitioning from female to male, and features illustrations that may appeal to young readers, including one of a 'gender-neutral' unicorn whose genitals are masked with a star.
Video and voice calling allows people to call over the internet rather than phone networks, avoiding the expense that can often come with calling outside of the country or for extended times.
Internet calling over Whats App and Viber were already blocked.
The treatment is controversially available to children on the NHS, as first revealed by The Mail on Sunday.
Billed by the publishers as 'the first book to explain medical transitioning for children aged seven and above', it is distributed by Educate & Celebrate, a Government-funded body that goes into primary and secondary schools to give lessons on 'gender diversity'.
It isn’t clear exactly why the features have been blocked in the country.
But local reports have speculated that it is a way of protecting the revenues of traditional telecoms companies.
The organisation received £200,000 of taxpayer-funding from former Education Secretary Nicky Morgan and is endorsed by Ofsted.
Earlier this year, the watchdog described as 'innovative and visionary' their work educating staff and children on gender and sexuality.
HOPE (4673) to be connected with a trained staff member from a sexual assault service provider in your area. HOPE (4673), you’ll be routed to a local RAINN affiliate organization based on the first six digits of your phone number.
Cell phone callers have the option to enter the ZIP code of their current location to more accurately locate the nearest sexual assault service provider.
Instant Live Video sex and cam shows all shot in High definition from the p rivacy of their own bedroom for your own private Video Sex show!