Can I upgrade to iOS 7 beta?

Not sure, but why not just wait til 2 weeks (rumoured)

lovewd said:

So here is my situation. I want to upgrade to iOS 7, but I don't want to lose my unlock. I bought the phone from some guy off of craigslist, and it was unlocked when I got it. I am not sure if he had it carrier unlocked directly from at&t or some unlock method on the internet. So I am really wondering, would updating to the beta re lock my phone? By the way it is a 16GB iPhone 4

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Just wait until it's officialy released 'cause you don't seem to know jack about betas and whatnot

There are only 3 possible ways it could be unlocked:

Ultrasn0w via Cydia
sim interposer in sim slot with carrier sim
IMEI unlock

If it it either of first 2 methods, when you update, you lose the unlock.
The IMEI unlock is forever.

Honestly, if you require the phone to be unlocked, without knowing what you are doing, I recommend you stay clear of updating since going from beta to GM can be semi-technical

lovewd said:

It's not like I don't know anything. I already put it on my iPad. I just don't want to lose my unlock. But I guess I'll just wait

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Check online to see if its imei unlocked... ive used imei.info and its free... (if im not supposed to post that link, sorry)

lovewd said:

So here is my situation. I want to upgrade to iOS 7, but I don't want to lose my unlock. I bought the phone from some guy off of craigslist, and it was unlocked when I got it. I am not sure if he had it carrier unlocked directly from at&t or some unlock method on the internet. So I am really wondering, would updating to the beta re lock my phone? By the way it is a 16GB iPhone 4

Click to expand...

iOS 7 on iPhone 4 is dreadful, it's so slow and laggy and just ugh, wait until the full release, trust me, I have the beta on my 4 and it's pretty bad..
If you do insist on putting the beta on there, no, it won't reset the unlock, (mine was unlocked when I updated to the beta)

It just depends on how it was unlocked. If it was a jailbroken/software unlock then it won't be preserved. If it was IMEI unlocked then it will be preserved.

dhlizard said:

There are only 3 possible ways it could be unlocked:

Ultrasn0w via Cydia
sim interposer in sim slot with carrier sim
IMEI unlock

If it it either of first 2 methods, when you update, you lose the unlock.
The IMEI unlock is forever.

Click to expand...

VTECaddict said:

It just depends on how it was unlocked. If it was a jailbroken/software unlock then it won't be preserved. If it was IMEI unlocked then it will be preserved.

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dlhlizard's response pretty well covered it three days ago.