Be careful of ‘online’ courses that promise that they are accepted worldwide and are accredited to a high standard. There are a number of issues that must be considered before doing an i-to-i TEFL course;

1. There is no actual teaching practice on this course. The weekend course (20hours) , the only classroom segment of the full course, is amongst your fellow tutees, and there are no real students to practice teaching on. Therefore, the i-to-i course fails on one of the major requirements of most schools; a Tefl course with practical teacher training.
2. The majority of the main course (100 hours) is studied entirely online, with no opportunity to demonstrate what you learnt in a real classroom. It’s no better than buying a TEFL book and studying it.
3. The 8000+ job list that is provided is very out of date, has few contacts with email addresses and is no better than looking online for your own contacts.
4. Accreditation is poor; ODLQC is a paid monkey that doesn’t do much checking of the course standards. Compared to the University accredited Celta and Trinity courses, the i-to-i shrivels in comparison.
5. Most ‘good’ or ’semi-decent’ schools do not recognise i-to-i TEFL certification. The only certifications that are accepted worldwide and that are respected are the CELTA, Trinity Tesol and University degrees in TEFL related subjects. Most schools that ‘accept’ i-to-i certificates would employ you regardless of having this certificate or not. Remember, demand for ‘native’ speakers of English out strips supply in China, Korea and Thailand.
6.You may be considering i-to-i because it portrays itself as a sustainable and ethical company, however it is owned by the uber-travel corporation TUI, which is anything but ethical.

What you need to consider is, for 3-400 pounds extra, you could study the Celta or Trinity in Thailand, Japan, UK, Spain etc, in a classroom with a real trainer, with actual teaching practice.