Use this info at your own risk as it may not be complete and/or be suitable in your circumstances. I make no guarantees and take no responsibility for any harm, loss or damage (so don't blame me if you lose your job, etc).
Assumptions:
- a relaxed IT policy given you haven't been caught yet (i.e. the company is not actively out to monitor what you're doing with company property/networks).
- no attempts by you to mask the traffic.
1. On a foreign network, your laptop would be the easiest source of history and thus private browsing is likely to minimize any records on your laptop (but it'll really depend on how effective your browser setup is at it, since Flash and other plugins may allow records to be kept outside of the browser). This also assumes that your company has not gone to the effort of installing software on your machine to monitor traffic. If for example your company laptop runs some kind of software antivirus/firewall, it may be possible to configure it to log all network traffic (making the browser's private mode ineffective). It should go without saying that disabling/removing your company installed antivirus/firewall is a bad idea.
2. Depends on whether you're on the cellular network or using WiFi to browse on the Blackberry. If using a foreign WiFi network, then your phone is obviously the easiest source of history. However, if you use the cellular network to browse on the phone, then the records would probably be stored by the phone company (pretty sure it would be mandated by telecommunications regulations for most countries). That said, not sure whether your company can access these records easily (it may require resorting to legal avenues to get access).
3. Company's office network traffic can be fully tracked regardless of device. Since they are already running a filter that blocks certain sites, it means they should already have the means to monitor where the traffic is going to/coming from within the company network. The traffic monitor/filter may be implemented by hardware or by software (or both). In any case, traffic records should be easily accessible by the company (it would just be a matter of how often these records are actually checked and acted upon, if at all).
Final words: If they really wanted to they should be able to catch you out already.
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Last edited by yyy111 at 5-1-2012 02:12 ]