You can see your Vendor ID:
General: At Home Screen Press alt + aA + h simultaneously.
Storm: At home screen press and hold escape, then press the left top corner, right top corner, left top corner and right top corner of the screen.
Blackberry 8100: ALT+RACE/Select Options->Advanced Options-> Applications, ALT+CAPS+H.

Here is the list of Vendor ID:
1 RIM Engineering
100 T-Mobile US
101 AWS
102 Cingular Wireless (AT&T)
103 Nextel
104 Sprint PCS
105 Verizon
106 Alltel
107 Rogers
109 BWA (Aliant/Sasktel)
111 MM02 DE
113 Telfort
114 T-Mobile DE/AU
115 TIM
116 Hutchison
117 Bouygues
118 SFR
119 Orange_France
120 VODAFONE (UK)
121 Telcel
122 Telstra
123 T-Mobile (UK)
124 Vodafone Germany
125 MM02 UK/IRL/NL
126 Telus
127 SMART
128 Starhub
129 Telefonica
130 Swisscom
131 Cable & Wireless
132 Vodafone (IT)
133 Vodafone (ES)
134 T-Mobile (NL)
135 Cincinnati Bell
136 Telefonica_LAM
137 Vodafone Austria
138 Vodafone Australia
139 Vodafone Ireland
140 Vodafone Sweden
141 CSL
142 Orange UK
143 Vodafone New Zealand
144 SingTel
145 Globe
146 Optus
147 Orange Mobistar
148 Vodafone_HU
149 Bharti
150 KPN (KAPAN)
151 TIM_Greece
152 Proximus
153 Vodafone_Portugal
154 TIM_Brazil
155 BT_Mobile
156 Earthlink
158 E-Plus
159 BASE
160 Dobson
161 Vodafone_Egypt
162 Orange_Switzerland
164 Triton
165 Maxis
166 Vodafone_Denmark_(TDC)
167 MobileOne_(Voda_Singapore/XL_Indonesia)
168 Vodacom
169 T-Mobile_PO
170 T-Mobile_CZ
171 T-Mobile_HU
173 MTN
174 Entel
175 Amena
176 SmarTone
177 TCS
178 Avea
179 F100
180 Turkcell
181 Partner
183 Orange_Global
186 Telkomsel
188 Vodafone_Greece
189 USCC
190 Mobilink
191 Velocita Wireless
194 Voda_Luxembourg
195 Voda_Iceland
197 Vodafone Romania (Mobifon)
198 Vodafone_CZ
199 Vodafone Bahrain
202 T-Mobile Slovakia – 4.6 and post
204 China_Mobile
205 Movilnet
209 Sympac
210 Personal Argentina (TIM_Argentina)
212 Etisalat/Etisalat Nigeria/Etisalat Misr
213 CBeyond
214 AMX
215 Telefonica_Venezuela
216 Telefonica Brazil
217 Orange Romania
218 KTP
220 DoCoMo
222 Vodafone Bulgaria (Mobitel Bulgaria)
224 PCCW/Sunday
225 Hawaiian Telcom/Credo Mobile
227 Mobily
228 BWA
229 O2 CZ (Eurotel)
230 Hutchison India (Hutchison Essar)
236 Reliance
237 Verizon
238 Vodafone Turkey
239 Telefonica Morocco (Meditel)
240 Indosat
241 Alcatel Shanghai Bell
245 3-UK/3-Italy/3-Sweden/3-Denmark/3-Austria
247 Vodafone Essar
248 Centennial Wireless/Centennial PR
250 T-Mobile AT (8110 & Post HW)
254 Oi Brazil255 Telecom New Zealand
258 3-Australia (H3GA)
259 Cable & Wireless TSTT/TSTT Trinidad and Tobago
269 TATA India
271 T-Mobile Croatia – 4.6 and post/T-Mobile Macedonia/T-Mobile Montenegro
273 BT Italy
274 1&1
277 MTS Mobility
278 Virgin Mobile
280 Orange Slovakia – 8120 Post
282 Taiwan Mobile
285 Orange Austria (ONE) (Full Launch)
286 Vodafone Malta288 BASE (JiM)
295 CMCC Peoples
298 Digitel (FULL LAUNCH)
301 Carphone Warehouse UK
304 XL (Excelcomindo_Indonesia)