HTC and O2 have a busy April planned. We’ve just received images from O2′s internal inventory systems confirming that the carrier is planning to launch the HTC One X, One S and One V on April 5th — which lines up with earlier rumors for the One X launch. O2 will require that One X and One V customers sign up for at least 500MB of data per month and minimum monthly contract of £37 and £32, respectively. The One V will be available without a data plan requirement but will require a minimum monthly contract of £10.50.

Our source also said that O2 is planning to launch the Sony Xperia P and Xperia U on April 23rd. The Xperia P will require a 24-month £37 monthly data plan contract while the Xperia U will require 24-month contract with a minimum monthly payment of £10.50.

It’s possible the monthly prices above could change if with O2′s “Hero Tariffs,” however, which range in price between £31 and £41 depending on the handset, amount of data and contract term. To be clear, these launch dates are only for O2, but perhaps there’s a chance that AT&T’s variants, and perhaps variants for other carriers, aren’t too far behind.

We learned more than just the launch dates from each phone. While the following information isn’t on display in the O2 system photos above, it comes from the same sources from which we obtained the images.

HTC One X

Release date: April 5th.
Requirements: Minimum 500MB data plan, £10.00 to insure, 24-month contract with 900 minutes and unlimited text messages.
Price to insure: £10.00

HTC One S:

Release Date: April 5th.
Requirements: Minimun 500MB data plan, £10.00 to insure, 24-month contract with 600 minutes or 500 O2 to O2 minutes.
Price to insure: £10.00.

HTC One V:

Release Date: April 5th.
Requirements: No data required, £6.00 to insure, 24-month contract with 50 minutes and 250 texts.
Price to insure: £6.00.

Sony Xperia P:

Release Date: April 23rd.
Requirements: £6.00 monthly data plan (presumably 500MB also), 24- month contract with 900 minutes and unlimited texts.
Price to insure: £7.50 to insure.

Sony Xperia U:

Release Date: April 23rd.
Requirements: No data required, £6.00 to insure, 24-month contract with 50 minutes and 250 texts.
Price to insure: £6.00 to insure.