Unlock T-Mobile cannot the internet with AT&T

[Zigntazcoke]

I bought the HTC sensation 4G (unlock)(T-Mobile) 2 days ago from ebay.
I went to AT&T to get the cellphone number. calling+text+2G data
So, i can call and text but i cannot connect the internet network.

Today, i went to AT&T again to fix this problem but the seller said "Sorry, your phone is T-Mobile unlock. So, you cannot connect to our internet network. You can only call on this phone"

What should i do? and do you think if i use other network except T-Mobile, i will can connect to the internet?

 

[MattMJB0188]

I bought the HTC sensation 4G (unlock)(T-Mobile) 2 days ago from ebay.
I went to AT&T to get the cellphone number. calling+text+2G data
So, i can call and text but i cannot connect the internet network.

Today, i went to AT&T again to fix this problem but the seller said "Sorry, your phone is T-Mobile unlock. So, you cannot connect to our internet network. You can only call on this phone"

What should i do? and do you think if i use other network except T-Mobile, i will can connect to the internet?

And getting the phone on T-Mobile isn't an option? Apparently the phone does have the AT&T 3G and HSPA+ bands in it but that's only for the merger and only T-Mobile can unlock them.

 

[Zigntazcoke]

So, do you think when i go back to Thailand. i will go back and open a cellphone number.
Can i use the Thai network on my HTC sensation?

I want to call and use the internet. T__T

 

[rex450se]

If it is unlocked you may just need to change the apn settings to those for AT&T. Similar to using an iPhone on T-Mobile. Yes, you will only get Edge data speeds, but it still should work.

Victor

 

[Zigntazcoke]

i want to but i can't

I go to Mobile network setting -> Access Point Names

Inside APNs mode. it doesn't have anything for clicking.

T__T Do you think it has the problem on my phone?

 

[bvann4g]

I have the same problem with my Skyrocket from ATT i have it unlock for T-moble
but won't on the T-moble internet. does any body know how to make it work?