SIM card with no internet connection from a blackberry app

[bb_bart]

I've got a problem with establishing an internet connection in a Blackberry Java application. Only under some specific conditions:
- a specific SIM card
- a specific set of handsets

I cannot establish a WAP2 connection with the GSM provider. Although I used a connection suffix like

http:/example.com/;ConnectionUID=WAP2 trans

I get an IOException with an info:

IOException (ID 3) occured: Failed to transmit

The suffix is taken from the contact book like that:

			String uid = null;
			ServiceBook sb = ServiceBook.getSB ();
			ServiceRecord[] records = sb.findRecordsByCid ("WPTCP");
			for (int i = 0; i < records.length; i++)
			{
				if (records[i].isValid () && !records[i].isDisabled ())
				{
					if (records[i].getUid () != null
							&& records[i].getUid ().length () != 0)
					{
						if ((records[i].getCid ().toLowerCase ().indexOf (
								"wptcp") != -1)
								&& (records[i].getUid ().toLowerCase ()
										.indexOf ("wifi") == -1)
								&& (records[i].getUid ().toLowerCase ()
										.indexOf ("mms") == -1))
						{
							// if wptcp and neither wifi nor mms
							// because we have checked wifi already and fir sure
							// we do not want mms
							uid = records[i].getUid ();
							break;
						}
					}
				}
			}

			if (uid != null)
			{
				// WAP2 Connection
				connSuffix = ";ConnectionUID=" + uid;
			}

What is curious, in the other networks it works and connection is correctly established...

any ideas? thanks in advance