Two-way texting - beware certain long numbers

There are lots of things to watch out for if you are going to implement 2-way texting and I'll try to write a full post another time, but very quickly, if learners are to text back to the college:

1. How much does it cost the college to implement 2-way texting? Janet (PageOne) charges extra for incoming accounts. Does anyone know what the charges are and can let me know?
2. Check that you do not get charged to receive incoming texts.
3. Check that learners don't end up paying extra to text you: some SMS providers give you a radiopaging number based in the Isle of Man, for instance, to keep their costs down. On T-mobile, this is classed as an international number and it costs 17p per text. Mobile numbers that start with 0762 should be checked, among others. Check this Excel sheet (http://www.ofcom.org.uk/static/numbering/index.htm#pers) against your incoming number and query your supplier if the number given to you is a radio paging number, or a number based in Guernsey etc. Also check with your learners if they are being charged extra to use the number. Ideally, the number you are allocated allows learners to text in using their existing contract allocation for text messages, or on pay as you go, it should cost 10p or less.
4. Can you set up your own text codes to give out to students? This should allow you to receive your own incoming texts to your email or a web page that only you access. You don't want to sort through thousands of texts from learners.
5. If using a short code (like 80010), ensure it's zero-rated so learners don't get charged more than the standard charge for texting to that number.