Please go through the following story and then answer.
My friend (Mr. F) came to know from an advertisement published at some institution's notice board that a professor (Prof. P) is looking for a student to work in a project at his laboratory. So he sent curriculum vita to apply. Next morning he got a mobile phone call from Prof. P asking if he was really interested to work and he agreed. His home town is 2000 km (1243 miles) away form the institution. Prof P told Mr. F to arrange a railway ticket for this trip. Also Prof. P asked Mr. F not to send any mail. All arrangements (railway ticket, money etc) were completed and informed to Prof. P who told him that a letter will be sent for an interview in his department. Date of the interview will be fixed according to the date of his reaching which is already informed by Mr. F.
Seven days has gone. Prof. P did not sent any mail. Once Mr. F asked him by phone and inquired for this interview latter. Prof P told that "Interview letter is not a matter, just come, you shall not face any problem, actually I am very busy."
All the talks has done via telephone, no mail, so there is no proof that Prof P invited Mr. F or told him for travel arrangement.
This is a problem of my friend's. However, your answers will also be helpful for me. Should Mr. F go without a printed document? What should he do now? He has no documentary proof. Shall he cancel all travel arrangements?
This is my question, and will be helpful for my friend for his next application. Should I remove telephone number from my curriculum vita next when I shall apply for such a post?
Edits after a few responces:
Prof. P and Mr.F lives in different ends of India. Prof. P is a professor of a top Indian institution. Mr. F has completed M.Sc. degree from some another institution and is currently unemployed.
The Indian government has several funding agencies like DRDO, CSIR, DST, MHRD, NBHM, UGC, BNRS etc. They give research fund to some professors of different institutions and universities. They can employ research fellows at their laboratory whose salary (generally Rs. 16000/ month) comes from this fund. The student may get a PhD degree if he can be able to join the PhD programme of the university or institution. But joining in a project work and joining in PhD programme are independent events. For joining a project he does not need to join in any programme on the institution, but he usually enjoys all the facilities like a PhD scholar. He may or may not get a travel salary for interview. In our case Mr.F may not get it as it is not mentioned in the advertisement.