Avoid this shop at all costs! I'm begging you, just don't go there! They are so hostile, so unprofessional. Once you sign the contract with them, there is nothing you can do to cancel it, unless your phone has no signal in your area.
They won't advice you, if you think they do. They will totally mislead just so sell the mobile. After you sign with them, no sympathy whatsoever, just go an never go back, whatever the reason - it's their philosophy.
The manager is never there, when you ask for him, he or she either doesn't exists or is always hiding somewhere behind the curtains. He/she always send his shop assistants to deal with the complaints. The shop assistants are awful, so awful, they luck of competence, friendliness, face stone cold, it's just awful service. They don't know the basic policies.
Here's the lesson I've learnt a hard way: be aware of high street mobile phone shops. They are third parties, that means that even if they represent and sell phones like from "3 phone" company, they have their own, independent rules, like no rules. If you want to buy a mobile, go online, you'll get professional advice and you can cancel your contract within 7 days if you want or return phone for exchange within 14 days. If I only new that before ...